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Finding the Fourth Proportional to 1,205.18, 1,663.08 and 681.10

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Solution

The fourth proportional to 1,205.18, 1,663.08 and 681.10 is: 939.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.18 : 1,663.08 = 681.10 : x
  2. Step 2: Convert to fraction form
    1,205.18/1,663.08 = 681.10/x
  3. Step 3: Cross multiply
    1,205.18x = 1,663.08 × 681.10
  4. Step 4: Simplify right side
    1,205.18x = 1,132,723.79
  5. Step 5: Solve for x
    x = 1,132,723.79/1,205.18
  6. Step 6: Final answer
    x = 939.88

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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.