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Finding the Fourth Proportional to 1,387.47, 2,081.18 and 400.29

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Solution

The fourth proportional to 1,387.47, 2,081.18 and 400.29 is: 600.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.47 : 2,081.18 = 400.29 : x
  2. Step 2: Convert to fraction form
    1,387.47/2,081.18 = 400.29/x
  3. Step 3: Cross multiply
    1,387.47x = 2,081.18 × 400.29
  4. Step 4: Simplify right side
    1,387.47x = 833,066.71
  5. Step 5: Solve for x
    x = 833,066.71/1,387.47
  6. Step 6: Final answer
    x = 600.42

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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.