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Finding the Fourth Proportional to 1,109.92, 1,663.80 and 461.20

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Solution

The fourth proportional to 1,109.92, 1,663.80 and 461.20 is: 691.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.92 : 1,663.80 = 461.20 : x
  2. Step 2: Convert to fraction form
    1,109.92/1,663.80 = 461.20/x
  3. Step 3: Cross multiply
    1,109.92x = 1,663.80 × 461.20
  4. Step 4: Simplify right side
    1,109.92x = 767,344.56
  5. Step 5: Solve for x
    x = 767,344.56/1,109.92
  6. Step 6: Final answer
    x = 691.35

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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.