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Finding the Fourth Proportional to 1,387.92, 2,081.72 and 414.02

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Solution

The fourth proportional to 1,387.92, 2,081.72 and 414.02 is: 620.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.92 : 2,081.72 = 414.02 : x
  2. Step 2: Convert to fraction form
    1,387.92/2,081.72 = 414.02/x
  3. Step 3: Cross multiply
    1,387.92x = 2,081.72 × 414.02
  4. Step 4: Simplify right side
    1,387.92x = 861,873.71
  5. Step 5: Solve for x
    x = 861,873.71/1,387.92
  6. Step 6: Final answer
    x = 620.98

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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.