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Finding the Fourth Proportional to 810.72, 1,118.76 and 461.42

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Solution

The fourth proportional to 810.72, 1,118.76 and 461.42 is: 636.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.72 : 1,118.76 = 461.42 : x
  2. Step 2: Convert to fraction form
    810.72/1,118.76 = 461.42/x
  3. Step 3: Cross multiply
    810.72x = 1,118.76 × 461.42
  4. Step 4: Simplify right side
    810.72x = 516,212.65
  5. Step 5: Solve for x
    x = 516,212.65/810.72
  6. Step 6: Final answer
    x = 636.73

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Find fourth proportional to 405.36, 559.38 and 230.71
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.