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Finding the Fourth Proportional to 72,159.65, 99,581.45 and 40,330.61

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Solution

The fourth proportional to 72,159.65, 99,581.45 and 40,330.61 is: 55,656.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,159.65 : 99,581.45 = 40,330.61 : x
  2. Step 2: Convert to fraction form
    72,159.65/99,581.45 = 40,330.61/x
  3. Step 3: Cross multiply
    72,159.65x = 99,581.45 × 40,330.61
  4. Step 4: Simplify right side
    72,159.65x = 4,016,180,623.18
  5. Step 5: Solve for x
    x = 4,016,180,623.18/72,159.65
  6. Step 6: Final answer
    x = 55,656.88

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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.