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Finding the Fourth Proportional to 2,472.32, 3,709.22 and 991.53

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Solution

The fourth proportional to 2,472.32, 3,709.22 and 991.53 is: 1,487.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,472.32 : 3,709.22 = 991.53 : x
  2. Step 2: Convert to fraction form
    2,472.32/3,709.22 = 991.53/x
  3. Step 3: Cross multiply
    2,472.32x = 3,709.22 × 991.53
  4. Step 4: Simplify right side
    2,472.32x = 3,677,797.95
  5. Step 5: Solve for x
    x = 3,677,797.95/2,472.32
  6. Step 6: Final answer
    x = 1,487.59

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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.