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Finding the Fourth Proportional to 72,697.90, 100,322.55 and 40,432.80

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Solution

The fourth proportional to 72,697.90, 100,322.55 and 40,432.80 is: 55,796.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,697.90 : 100,322.55 = 40,432.80 : x
  2. Step 2: Convert to fraction form
    72,697.90/100,322.55 = 40,432.80/x
  3. Step 3: Cross multiply
    72,697.90x = 100,322.55 × 40,432.80
  4. Step 4: Simplify right side
    72,697.90x = 4,056,321,599.64
  5. Step 5: Solve for x
    x = 4,056,321,599.64/72,697.90
  6. Step 6: Final answer
    x = 55,796.96

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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.