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Finding the Fourth Proportional to 78,172.92, 107,873.91 and 45,902.88

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Solution

The fourth proportional to 78,172.92, 107,873.91 and 45,902.88 is: 63,343.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,172.92 : 107,873.91 = 45,902.88 : x
  2. Step 2: Convert to fraction form
    78,172.92/107,873.91 = 45,902.88/x
  3. Step 3: Cross multiply
    78,172.92x = 107,873.91 × 45,902.88
  4. Step 4: Simplify right side
    78,172.92x = 4,951,723,145.86
  5. Step 5: Solve for x
    x = 4,951,723,145.86/78,172.92
  6. Step 6: Final answer
    x = 63,343.20

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1.5x scale

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.