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Finding the Fourth Proportional to 1,387.54, 1,914.80 and 758.08

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Solution

The fourth proportional to 1,387.54, 1,914.80 and 758.08 is: 1,046.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.54 : 1,914.80 = 758.08 : x
  2. Step 2: Convert to fraction form
    1,387.54/1,914.80 = 758.08/x
  3. Step 3: Cross multiply
    1,387.54x = 1,914.80 × 758.08
  4. Step 4: Simplify right side
    1,387.54x = 1,451,562.01
  5. Step 5: Solve for x
    x = 1,451,562.01/1,387.54
  6. Step 6: Final answer
    x = 1,046.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.