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Finding the Fourth Proportional to 1,591.31, 2,387.90 and 666.79

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Solution

The fourth proportional to 1,591.31, 2,387.90 and 666.79 is: 1,000.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591.31 : 2,387.90 = 666.79 : x
  2. Step 2: Convert to fraction form
    1,591.31/2,387.90 = 666.79/x
  3. Step 3: Cross multiply
    1,591.31x = 2,387.90 × 666.79
  4. Step 4: Simplify right side
    1,591.31x = 1,592,227.84
  5. Step 5: Solve for x
    x = 1,592,227.84/1,591.31
  6. Step 6: Final answer
    x = 1,000.58

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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.