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Finding the Fourth Proportional to 1,153.68, 1,732.20 and 667.68

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Solution

The fourth proportional to 1,153.68, 1,732.20 and 667.68 is: 1,002.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.68 : 1,732.20 = 667.68 : x
  2. Step 2: Convert to fraction form
    1,153.68/1,732.20 = 667.68/x
  3. Step 3: Cross multiply
    1,153.68x = 1,732.20 × 667.68
  4. Step 4: Simplify right side
    1,153.68x = 1,156,555.30
  5. Step 5: Solve for x
    x = 1,156,555.30/1,153.68
  6. Step 6: Final answer
    x = 1,002.49

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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.