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Finding the Fourth Proportional to 1,179.30, 1,627.36 and 681.90

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Solution

The fourth proportional to 1,179.30, 1,627.36 and 681.90 is: 940.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.30 : 1,627.36 = 681.90 : x
  2. Step 2: Convert to fraction form
    1,179.30/1,627.36 = 681.90/x
  3. Step 3: Cross multiply
    1,179.30x = 1,627.36 × 681.90
  4. Step 4: Simplify right side
    1,179.30x = 1,109,700.85
  5. Step 5: Solve for x
    x = 1,109,700.85/1,179.30
  6. Step 6: Final answer
    x = 940.98

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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.