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Finding the Fourth Proportional to 1,147.62, 1,581.45 and 815.47

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Solution

The fourth proportional to 1,147.62, 1,581.45 and 815.47 is: 1,123.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.62 : 1,581.45 = 815.47 : x
  2. Step 2: Convert to fraction form
    1,147.62/1,581.45 = 815.47/x
  3. Step 3: Cross multiply
    1,147.62x = 1,581.45 × 815.47
  4. Step 4: Simplify right side
    1,147.62x = 1,289,625.03
  5. Step 5: Solve for x
    x = 1,289,625.03/1,147.62
  6. Step 6: Final answer
    x = 1,123.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.