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Finding the Fourth Proportional to 1,187.48, 1,781.17 and 321.82

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Solution

The fourth proportional to 1,187.48, 1,781.17 and 321.82 is: 482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.48 : 1,781.17 = 321.82 : x
  2. Step 2: Convert to fraction form
    1,187.48/1,781.17 = 321.82/x
  3. Step 3: Cross multiply
    1,187.48x = 1,781.17 × 321.82
  4. Step 4: Simplify right side
    1,187.48x = 573,216.13
  5. Step 5: Solve for x
    x = 573,216.13/1,187.48
  6. Step 6: Final answer
    x = 482.72

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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.