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Finding the Fourth Proportional to 386.66, 532.89 and 292.91

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Solution

The fourth proportional to 386.66, 532.89 and 292.91 is: 403.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.66 : 532.89 = 292.91 : x
  2. Step 2: Convert to fraction form
    386.66/532.89 = 292.91/x
  3. Step 3: Cross multiply
    386.66x = 532.89 × 292.91
  4. Step 4: Simplify right side
    386.66x = 156,086.15
  5. Step 5: Solve for x
    x = 156,086.15/386.66
  6. Step 6: Final answer
    x = 403.68

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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.