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Finding the Fourth Proportional to 515.47, 772.31 and 429.36

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Solution

The fourth proportional to 515.47, 772.31 and 429.36 is: 643.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.47 : 772.31 = 429.36 : x
  2. Step 2: Convert to fraction form
    515.47/772.31 = 429.36/x
  3. Step 3: Cross multiply
    515.47x = 772.31 × 429.36
  4. Step 4: Simplify right side
    515.47x = 331,596.87
  5. Step 5: Solve for x
    x = 331,596.87/515.47
  6. Step 6: Final answer
    x = 643.29

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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.