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Finding the Fourth Proportional to 86,601.80, 129,902.70 and 72,021.80

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Solution

The fourth proportional to 86,601.80, 129,902.70 and 72,021.80 is: 108,032.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,601.80 : 129,902.70 = 72,021.80 : x
  2. Step 2: Convert to fraction form
    86,601.80/129,902.70 = 72,021.80/x
  3. Step 3: Cross multiply
    86,601.80x = 129,902.70 × 72,021.80
  4. Step 4: Simplify right side
    86,601.80x = 9,355,826,278.86
  5. Step 5: Solve for x
    x = 9,355,826,278.86/86,601.80
  6. Step 6: Final answer
    x = 108,032.70

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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.