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Finding the Fourth Proportional to 814.12, 1,123.12 and 515.28

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Solution

The fourth proportional to 814.12, 1,123.12 and 515.28 is: 710.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.12 : 1,123.12 = 515.28 : x
  2. Step 2: Convert to fraction form
    814.12/1,123.12 = 515.28/x
  3. Step 3: Cross multiply
    814.12x = 1,123.12 × 515.28
  4. Step 4: Simplify right side
    814.12x = 578,721.27
  5. Step 5: Solve for x
    x = 578,721.27/814.12
  6. Step 6: Final answer
    x = 710.86

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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.