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Finding the Fourth Proportional to 99,479.88, 137,311.20 and 79,476.12

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Solution

The fourth proportional to 99,479.88, 137,311.20 and 79,476.12 is: 109,700.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,479.88 : 137,311.20 = 79,476.12 : x
  2. Step 2: Convert to fraction form
    99,479.88/137,311.20 = 79,476.12/x
  3. Step 3: Cross multiply
    99,479.88x = 137,311.20 × 79,476.12
  4. Step 4: Simplify right side
    99,479.88x = 10,912,961,408.54
  5. Step 5: Solve for x
    x = 10,912,961,408.54/99,479.88
  6. Step 6: Final answer
    x = 109,700.19

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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.