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Finding the Fourth Proportional to 1,187.60, 1,781.39 and 321.91

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Solution

The fourth proportional to 1,187.60, 1,781.39 and 321.91 is: 482.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.60 : 1,781.39 = 321.91 : x
  2. Step 2: Convert to fraction form
    1,187.60/1,781.39 = 321.91/x
  3. Step 3: Cross multiply
    1,187.60x = 1,781.39 × 321.91
  4. Step 4: Simplify right side
    1,187.60x = 573,443.61
  5. Step 5: Solve for x
    x = 573,443.61/1,187.60
  6. Step 6: Final answer
    x = 482.86

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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.