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Finding the Fourth Proportional to 1,387.35, 2,080.76 and 400.28

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Solution

The fourth proportional to 1,387.35, 2,080.76 and 400.28 is: 600.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.35 : 2,080.76 = 400.28 : x
  2. Step 2: Convert to fraction form
    1,387.35/2,080.76 = 400.28/x
  3. Step 3: Cross multiply
    1,387.35x = 2,080.76 × 400.28
  4. Step 4: Simplify right side
    1,387.35x = 832,874.21
  5. Step 5: Solve for x
    x = 832,874.21/1,387.35
  6. Step 6: Final answer
    x = 600.33

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1.5x scale

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.