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Finding the Fourth Proportional to 672.18, 928.05 and 517.62

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Solution

The fourth proportional to 672.18, 928.05 and 517.62 is: 714.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.18 : 928.05 = 517.62 : x
  2. Step 2: Convert to fraction form
    672.18/928.05 = 517.62/x
  3. Step 3: Cross multiply
    672.18x = 928.05 × 517.62
  4. Step 4: Simplify right side
    672.18x = 480,377.24
  5. Step 5: Solve for x
    x = 480,377.24/672.18
  6. Step 6: Final answer
    x = 714.66

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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.