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Finding the Fourth Proportional to 1,108.49, 1,663.13 and 491.74

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Solution

The fourth proportional to 1,108.49, 1,663.13 and 491.74 is: 737.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.49 : 1,663.13 = 491.74 : x
  2. Step 2: Convert to fraction form
    1,108.49/1,663.13 = 491.74/x
  3. Step 3: Cross multiply
    1,108.49x = 1,663.13 × 491.74
  4. Step 4: Simplify right side
    1,108.49x = 817,824.62
  5. Step 5: Solve for x
    x = 817,824.62/1,108.49
  6. Step 6: Final answer
    x = 737.79

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Double scale
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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.