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Finding the Fourth Proportional to 1,108.23, 1,660.79 and 491.77

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Solution

The fourth proportional to 1,108.23, 1,660.79 and 491.77 is: 736.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.23 : 1,660.79 = 491.77 : x
  2. Step 2: Convert to fraction form
    1,108.23/1,660.79 = 491.77/x
  3. Step 3: Cross multiply
    1,108.23x = 1,660.79 × 491.77
  4. Step 4: Simplify right side
    1,108.23x = 816,726.70
  5. Step 5: Solve for x
    x = 816,726.70/1,108.23
  6. Step 6: Final answer
    x = 736.96

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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.