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Finding the Fourth Proportional to 1,251.64, 1,878.68 and 765.64

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Solution

The fourth proportional to 1,251.64, 1,878.68 and 765.64 is: 1,149.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.64 : 1,878.68 = 765.64 : x
  2. Step 2: Convert to fraction form
    1,251.64/1,878.68 = 765.64/x
  3. Step 3: Cross multiply
    1,251.64x = 1,878.68 × 765.64
  4. Step 4: Simplify right side
    1,251.64x = 1,438,392.56
  5. Step 5: Solve for x
    x = 1,438,392.56/1,251.64
  6. Step 6: Final answer
    x = 1,149.21

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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.