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Finding the Fourth Proportional to 1,387.14, 1,915.10 and 863.88

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Solution

The fourth proportional to 1,387.14, 1,915.10 and 863.88 is: 1,192.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.14 : 1,915.10 = 863.88 : x
  2. Step 2: Convert to fraction form
    1,387.14/1,915.10 = 863.88/x
  3. Step 3: Cross multiply
    1,387.14x = 1,915.10 × 863.88
  4. Step 4: Simplify right side
    1,387.14x = 1,654,412.27
  5. Step 5: Solve for x
    x = 1,654,412.27/1,387.14
  6. Step 6: Final answer
    x = 1,192.68

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1.5x scale

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.