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Finding the Fourth Proportional to 1,136.82, 1,705.95 and 487.74

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Solution

The fourth proportional to 1,136.82, 1,705.95 and 487.74 is: 731.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.82 : 1,705.95 = 487.74 : x
  2. Step 2: Convert to fraction form
    1,136.82/1,705.95 = 487.74/x
  3. Step 3: Cross multiply
    1,136.82x = 1,705.95 × 487.74
  4. Step 4: Simplify right side
    1,136.82x = 832,060.05
  5. Step 5: Solve for x
    x = 832,060.05/1,136.82
  6. Step 6: Final answer
    x = 731.92

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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.