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Finding the Fourth Proportional to 810.77, 1,118.81 and 461.45

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Solution

The fourth proportional to 810.77, 1,118.81 and 461.45 is: 636.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.77 : 1,118.81 = 461.45 : x
  2. Step 2: Convert to fraction form
    810.77/1,118.81 = 461.45/x
  3. Step 3: Cross multiply
    810.77x = 1,118.81 × 461.45
  4. Step 4: Simplify right side
    810.77x = 516,270.43
  5. Step 5: Solve for x
    x = 516,270.43/810.77
  6. Step 6: Final answer
    x = 636.77

Related Problems

Find fourth proportional to 405.38, 559.41 and 230.72
Half scale
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Double scale
Find fourth proportional to 811.77, 1,120.19 and 462.45
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.