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Finding the Fourth Proportional to 72,675.40, 100,008.66 and 64,311.88

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Solution

The fourth proportional to 72,675.40, 100,008.66 and 64,311.88 is: 88,499.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,675.40 : 100,008.66 = 64,311.88 : x
  2. Step 2: Convert to fraction form
    72,675.40/100,008.66 = 64,311.88/x
  3. Step 3: Cross multiply
    72,675.40x = 100,008.66 × 64,311.88
  4. Step 4: Simplify right side
    72,675.40x = 6,431,744,940.88
  5. Step 5: Solve for x
    x = 6,431,744,940.88/72,675.40
  6. Step 6: Final answer
    x = 88,499.62

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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.