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Finding the Fourth Proportional to 1,136.28, 1,701.67 and 647.85

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Solution

The fourth proportional to 1,136.28, 1,701.67 and 647.85 is: 970.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.28 : 1,701.67 = 647.85 : x
  2. Step 2: Convert to fraction form
    1,136.28/1,701.67 = 647.85/x
  3. Step 3: Cross multiply
    1,136.28x = 1,701.67 × 647.85
  4. Step 4: Simplify right side
    1,136.28x = 1,102,426.91
  5. Step 5: Solve for x
    x = 1,102,426.91/1,136.28
  6. Step 6: Final answer
    x = 970.21

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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.