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Finding the Fourth Proportional to 81,718.64, 122,597.64 and 28,402.88

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Solution

The fourth proportional to 81,718.64, 122,597.64 and 28,402.88 is: 42,611.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,718.64 : 122,597.64 = 28,402.88 : x
  2. Step 2: Convert to fraction form
    81,718.64/122,597.64 = 28,402.88/x
  3. Step 3: Cross multiply
    81,718.64x = 122,597.64 × 28,402.88
  4. Step 4: Simplify right side
    81,718.64x = 3,482,126,057.20
  5. Step 5: Solve for x
    x = 3,482,126,057.20/81,718.64
  6. Step 6: Final answer
    x = 42,611.16

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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.