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Finding the Fourth Proportional to 1,187.47, 1,781.20 and 321.78

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Solution

The fourth proportional to 1,187.47, 1,781.20 and 321.78 is: 482.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.47 : 1,781.20 = 321.78 : x
  2. Step 2: Convert to fraction form
    1,187.47/1,781.20 = 321.78/x
  3. Step 3: Cross multiply
    1,187.47x = 1,781.20 × 321.78
  4. Step 4: Simplify right side
    1,187.47x = 573,154.54
  5. Step 5: Solve for x
    x = 573,154.54/1,187.47
  6. Step 6: Final answer
    x = 482.67

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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.