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Finding the Fourth Proportional to 810.23, 1,117.31 and 611.55

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Solution

The fourth proportional to 810.23, 1,117.31 and 611.55 is: 843.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.23 : 1,117.31 = 611.55 : x
  2. Step 2: Convert to fraction form
    810.23/1,117.31 = 611.55/x
  3. Step 3: Cross multiply
    810.23x = 1,117.31 × 611.55
  4. Step 4: Simplify right side
    810.23x = 683,287.87
  5. Step 5: Solve for x
    x = 683,287.87/810.23
  6. Step 6: Final answer
    x = 843.33

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Double scale
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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.