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Finding the Fourth Proportional to 1,136.27, 1,705.12 and 487

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Solution

The fourth proportional to 1,136.27, 1,705.12 and 487 is: 730.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.27 : 1,705.12 = 487 : x
  2. Step 2: Convert to fraction form
    1,136.27/1,705.12 = 487/x
  3. Step 3: Cross multiply
    1,136.27x = 1,705.12 × 487
  4. Step 4: Simplify right side
    1,136.27x = 830,393.44
  5. Step 5: Solve for x
    x = 830,393.44/1,136.27
  6. Step 6: Final answer
    x = 730.81

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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.