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Finding the Fourth Proportional to 869.20, 1,301.10 and 502.90

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Solution

The fourth proportional to 869.20, 1,301.10 and 502.90 is: 752.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.20 : 1,301.10 = 502.90 : x
  2. Step 2: Convert to fraction form
    869.20/1,301.10 = 502.90/x
  3. Step 3: Cross multiply
    869.20x = 1,301.10 × 502.90
  4. Step 4: Simplify right side
    869.20x = 654,323.19
  5. Step 5: Solve for x
    x = 654,323.19/869.20
  6. Step 6: Final answer
    x = 752.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.