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Finding the Fourth Proportional to 641.67, 885.52 and 392.98

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Solution

The fourth proportional to 641.67, 885.52 and 392.98 is: 542.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.67 : 885.52 = 392.98 : x
  2. Step 2: Convert to fraction form
    641.67/885.52 = 392.98/x
  3. Step 3: Cross multiply
    641.67x = 885.52 × 392.98
  4. Step 4: Simplify right side
    641.67x = 347,989.68
  5. Step 5: Solve for x
    x = 347,989.68/641.67
  6. Step 6: Final answer
    x = 542.32

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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.