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Finding the Fourth Proportional to 1,178.92, 1,627.19 and 681.68

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Solution

The fourth proportional to 1,178.92, 1,627.19 and 681.68 is: 940.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.92 : 1,627.19 = 681.68 : x
  2. Step 2: Convert to fraction form
    1,178.92/1,627.19 = 681.68/x
  3. Step 3: Cross multiply
    1,178.92x = 1,627.19 × 681.68
  4. Step 4: Simplify right side
    1,178.92x = 1,109,226.10
  5. Step 5: Solve for x
    x = 1,109,226.10/1,178.92
  6. Step 6: Final answer
    x = 940.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.