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Finding the Fourth Proportional to 1,187.26, 1,780.12 and 667.32

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Solution

The fourth proportional to 1,187.26, 1,780.12 and 667.32 is: 1,000.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.26 : 1,780.12 = 667.32 : x
  2. Step 2: Convert to fraction form
    1,187.26/1,780.12 = 667.32/x
  3. Step 3: Cross multiply
    1,187.26x = 1,780.12 × 667.32
  4. Step 4: Simplify right side
    1,187.26x = 1,187,909.68
  5. Step 5: Solve for x
    x = 1,187,909.68/1,187.26
  6. Step 6: Final answer
    x = 1,000.55

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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.