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Finding the Fourth Proportional to 1,387.68, 2,080.75 and 462.74

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Solution

The fourth proportional to 1,387.68, 2,080.75 and 462.74 is: 693.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.68 : 2,080.75 = 462.74 : x
  2. Step 2: Convert to fraction form
    1,387.68/2,080.75 = 462.74/x
  3. Step 3: Cross multiply
    1,387.68x = 2,080.75 × 462.74
  4. Step 4: Simplify right side
    1,387.68x = 962,850.30
  5. Step 5: Solve for x
    x = 962,850.30/1,387.68
  6. Step 6: Final answer
    x = 693.86

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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.