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Finding the Fourth Proportional to 385.61, 531.72 and 354.39

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Solution

The fourth proportional to 385.61, 531.72 and 354.39 is: 488.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.61 : 531.72 = 354.39 : x
  2. Step 2: Convert to fraction form
    385.61/531.72 = 354.39/x
  3. Step 3: Cross multiply
    385.61x = 531.72 × 354.39
  4. Step 4: Simplify right side
    385.61x = 188,436.25
  5. Step 5: Solve for x
    x = 188,436.25/385.61
  6. Step 6: Final answer
    x = 488.68

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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.