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Finding the Fourth Proportional to 626.40, 862.56 and 515.52

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Solution

The fourth proportional to 626.40, 862.56 and 515.52 is: 709.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.40 : 862.56 = 515.52 : x
  2. Step 2: Convert to fraction form
    626.40/862.56 = 515.52/x
  3. Step 3: Cross multiply
    626.40x = 862.56 × 515.52
  4. Step 4: Simplify right side
    626.40x = 444,666.93
  5. Step 5: Solve for x
    x = 444,666.93/626.40
  6. Step 6: Final answer
    x = 709.88

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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.