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Finding the Fourth Proportional to 1,387.71, 2,081.69 and 400.51

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Solution

The fourth proportional to 1,387.71, 2,081.69 and 400.51 is: 600.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.71 : 2,081.69 = 400.51 : x
  2. Step 2: Convert to fraction form
    1,387.71/2,081.69 = 400.51/x
  3. Step 3: Cross multiply
    1,387.71x = 2,081.69 × 400.51
  4. Step 4: Simplify right side
    1,387.71x = 833,743.87
  5. Step 5: Solve for x
    x = 833,743.87/1,387.71
  6. Step 6: Final answer
    x = 600.81

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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.