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Finding the Fourth Proportional to 688.69, 951.21 and 501.88

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Solution

The fourth proportional to 688.69, 951.21 and 501.88 is: 693.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.69 : 951.21 = 501.88 : x
  2. Step 2: Convert to fraction form
    688.69/951.21 = 501.88/x
  3. Step 3: Cross multiply
    688.69x = 951.21 × 501.88
  4. Step 4: Simplify right side
    688.69x = 477,393.27
  5. Step 5: Solve for x
    x = 477,393.27/688.69
  6. Step 6: Final answer
    x = 693.19

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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.