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Finding the Fourth Proportional to 86,909.62, 130,143.84 and 72,832.66

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Solution

The fourth proportional to 86,909.62, 130,143.84 and 72,832.66 is: 109,064.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,909.62 : 130,143.84 = 72,832.66 : x
  2. Step 2: Convert to fraction form
    86,909.62/130,143.84 = 72,832.66/x
  3. Step 3: Cross multiply
    86,909.62x = 130,143.84 × 72,832.66
  4. Step 4: Simplify right side
    86,909.62x = 9,478,722,049.81
  5. Step 5: Solve for x
    x = 9,478,722,049.81/86,909.62
  6. Step 6: Final answer
    x = 109,064.13

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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.