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Finding the Fourth Proportional to 1,187.55, 1,781.11 and 321.66

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Solution

The fourth proportional to 1,187.55, 1,781.11 and 321.66 is: 482.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.55 : 1,781.11 = 321.66 : x
  2. Step 2: Convert to fraction form
    1,187.55/1,781.11 = 321.66/x
  3. Step 3: Cross multiply
    1,187.55x = 1,781.11 × 321.66
  4. Step 4: Simplify right side
    1,187.55x = 572,911.84
  5. Step 5: Solve for x
    x = 572,911.84/1,187.55
  6. Step 6: Final answer
    x = 482.43

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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.