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Finding the Fourth Proportional to 1,147.38, 1,721.38 and 818.73

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Solution

The fourth proportional to 1,147.38, 1,721.38 and 818.73 is: 1,228.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.38 : 1,721.38 = 818.73 : x
  2. Step 2: Convert to fraction form
    1,147.38/1,721.38 = 818.73/x
  3. Step 3: Cross multiply
    1,147.38x = 1,721.38 × 818.73
  4. Step 4: Simplify right side
    1,147.38x = 1,409,345.45
  5. Step 5: Solve for x
    x = 1,409,345.45/1,147.38
  6. Step 6: Final answer
    x = 1,228.32

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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.