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Finding the Fourth Proportional to 99,793.20, 149,689.80 and 86,379.60

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Solution

The fourth proportional to 99,793.20, 149,689.80 and 86,379.60 is: 129,569.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,793.20 : 149,689.80 = 86,379.60 : x
  2. Step 2: Convert to fraction form
    99,793.20/149,689.80 = 86,379.60/x
  3. Step 3: Cross multiply
    99,793.20x = 149,689.80 × 86,379.60
  4. Step 4: Simplify right side
    99,793.20x = 12,930,145,048.08
  5. Step 5: Solve for x
    x = 12,930,145,048.08/99,793.20
  6. Step 6: Final answer
    x = 129,569.40

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1.5x scale

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.