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Finding the Fourth Proportional to 1,387.31, 2,080.50 and 462.61

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Solution

The fourth proportional to 1,387.31, 2,080.50 and 462.61 is: 693.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.31 : 2,080.50 = 462.61 : x
  2. Step 2: Convert to fraction form
    1,387.31/2,080.50 = 462.61/x
  3. Step 3: Cross multiply
    1,387.31x = 2,080.50 × 462.61
  4. Step 4: Simplify right side
    1,387.31x = 962,460.11
  5. Step 5: Solve for x
    x = 962,460.11/1,387.31
  6. Step 6: Final answer
    x = 693.76

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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.