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Finding the Fourth Proportional to 628.61, 866.52 and 517.91

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Solution

The fourth proportional to 628.61, 866.52 and 517.91 is: 713.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.61 : 866.52 = 517.91 : x
  2. Step 2: Convert to fraction form
    628.61/866.52 = 517.91/x
  3. Step 3: Cross multiply
    628.61x = 866.52 × 517.91
  4. Step 4: Simplify right side
    628.61x = 448,775.04
  5. Step 5: Solve for x
    x = 448,775.04/628.61
  6. Step 6: Final answer
    x = 713.92

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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.