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Finding the Fourth Proportional to 672.91, 928.67 and 393.17

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Solution

The fourth proportional to 672.91, 928.67 and 393.17 is: 542.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.91 : 928.67 = 393.17 : x
  2. Step 2: Convert to fraction form
    672.91/928.67 = 393.17/x
  3. Step 3: Cross multiply
    672.91x = 928.67 × 393.17
  4. Step 4: Simplify right side
    672.91x = 365,125.18
  5. Step 5: Solve for x
    x = 365,125.18/672.91
  6. Step 6: Final answer
    x = 542.61

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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.