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Finding the Fourth Proportional to 99,794.40, 149,472.90 and 86,672.40

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Solution

The fourth proportional to 99,794.40, 149,472.90 and 86,672.40 is: 129,818.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,794.40 : 149,472.90 = 86,672.40 : x
  2. Step 2: Convert to fraction form
    99,794.40/149,472.90 = 86,672.40/x
  3. Step 3: Cross multiply
    99,794.40x = 149,472.90 × 86,672.40
  4. Step 4: Simplify right side
    99,794.40x = 12,955,174,977.96
  5. Step 5: Solve for x
    x = 12,955,174,977.96/99,794.40
  6. Step 6: Final answer
    x = 129,818.66

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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.