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Finding the Fourth Proportional to 515.35, 772.12 and 429.23

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Solution

The fourth proportional to 515.35, 772.12 and 429.23 is: 643.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.35 : 772.12 = 429.23 : x
  2. Step 2: Convert to fraction form
    515.35/772.12 = 429.23/x
  3. Step 3: Cross multiply
    515.35x = 772.12 × 429.23
  4. Step 4: Simplify right side
    515.35x = 331,417.07
  5. Step 5: Solve for x
    x = 331,417.07/515.35
  6. Step 6: Final answer
    x = 643.09

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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.