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Finding the Fourth Proportional to 1,387.09, 2,079.19 and 553.83

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Solution

The fourth proportional to 1,387.09, 2,079.19 and 553.83 is: 830.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.09 : 2,079.19 = 553.83 : x
  2. Step 2: Convert to fraction form
    1,387.09/2,079.19 = 553.83/x
  3. Step 3: Cross multiply
    1,387.09x = 2,079.19 × 553.83
  4. Step 4: Simplify right side
    1,387.09x = 1,151,517.80
  5. Step 5: Solve for x
    x = 1,151,517.80/1,387.09
  6. Step 6: Final answer
    x = 830.17

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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.