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Finding the Fourth Proportional to 99,793.40, 149,471.40 and 86,671.40

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Solution

The fourth proportional to 99,793.40, 149,471.40 and 86,671.40 is: 129,817.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,793.40 : 149,471.40 = 86,671.40 : x
  2. Step 2: Convert to fraction form
    99,793.40/149,471.40 = 86,671.40/x
  3. Step 3: Cross multiply
    99,793.40x = 149,471.40 × 86,671.40
  4. Step 4: Simplify right side
    99,793.40x = 12,954,895,497.96
  5. Step 5: Solve for x
    x = 12,954,895,497.96/99,793.40
  6. Step 6: Final answer
    x = 129,817.16

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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.