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Finding the Fourth Proportional to 1,136.47, 1,703.25 and 989.59

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Solution

The fourth proportional to 1,136.47, 1,703.25 and 989.59 is: 1,483.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.47 : 1,703.25 = 989.59 : x
  2. Step 2: Convert to fraction form
    1,136.47/1,703.25 = 989.59/x
  3. Step 3: Cross multiply
    1,136.47x = 1,703.25 × 989.59
  4. Step 4: Simplify right side
    1,136.47x = 1,685,519.17
  5. Step 5: Solve for x
    x = 1,685,519.17/1,136.47
  6. Step 6: Final answer
    x = 1,483.12

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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.