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Finding the Fourth Proportional to 428.71, 591.61 and 239.66

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Solution

The fourth proportional to 428.71, 591.61 and 239.66 is: 330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.71 : 591.61 = 239.66 : x
  2. Step 2: Convert to fraction form
    428.71/591.61 = 239.66/x
  3. Step 3: Cross multiply
    428.71x = 591.61 × 239.66
  4. Step 4: Simplify right side
    428.71x = 141,781.10
  5. Step 5: Solve for x
    x = 141,781.10/428.71
  6. Step 6: Final answer
    x = 330.72

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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.