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Finding the Fourth Proportional to 72,909.78, 100,615.47 and 39,375.78

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Solution

The fourth proportional to 72,909.78, 100,615.47 and 39,375.78 is: 54,338.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,909.78 : 100,615.47 = 39,375.78 : x
  2. Step 2: Convert to fraction form
    72,909.78/100,615.47 = 39,375.78/x
  3. Step 3: Cross multiply
    72,909.78x = 100,615.47 × 39,375.78
  4. Step 4: Simplify right side
    72,909.78x = 3,961,812,611.32
  5. Step 5: Solve for x
    x = 3,961,812,611.32/72,909.78
  6. Step 6: Final answer
    x = 54,338.56

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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.