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Finding the Fourth Proportional to 1,187.24, 1,780.86 and 778.97

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Solution

The fourth proportional to 1,187.24, 1,780.86 and 778.97 is: 1,168.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.24 : 1,780.86 = 778.97 : x
  2. Step 2: Convert to fraction form
    1,187.24/1,780.86 = 778.97/x
  3. Step 3: Cross multiply
    1,187.24x = 1,780.86 × 778.97
  4. Step 4: Simplify right side
    1,187.24x = 1,387,227.61
  5. Step 5: Solve for x
    x = 1,387,227.61/1,187.24
  6. Step 6: Final answer
    x = 1,168.45

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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.