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Finding the Fourth Proportional to 709.71, 1,063.70 and 515.39

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Solution

The fourth proportional to 709.71, 1,063.70 and 515.39 is: 772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.71 : 1,063.70 = 515.39 : x
  2. Step 2: Convert to fraction form
    709.71/1,063.70 = 515.39/x
  3. Step 3: Cross multiply
    709.71x = 1,063.70 × 515.39
  4. Step 4: Simplify right side
    709.71x = 548,212.45
  5. Step 5: Solve for x
    x = 548,212.45/709.71
  6. Step 6: Final answer
    x = 772.45

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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.