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Finding the Fourth Proportional to 487.20, 731.48 and 384.60

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Solution

The fourth proportional to 487.20, 731.48 and 384.60 is: 577.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.20 : 731.48 = 384.60 : x
  2. Step 2: Convert to fraction form
    487.20/731.48 = 384.60/x
  3. Step 3: Cross multiply
    487.20x = 731.48 × 384.60
  4. Step 4: Simplify right side
    487.20x = 281,325.29
  5. Step 5: Solve for x
    x = 281,325.29/487.20
  6. Step 6: Final answer
    x = 577.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.