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Finding the Fourth Proportional to 72,561.88, 100,129.88 and 40,724.64

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Solution

The fourth proportional to 72,561.88, 100,129.88 and 40,724.64 is: 56,196.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,561.88 : 100,129.88 = 40,724.64 : x
  2. Step 2: Convert to fraction form
    72,561.88/100,129.88 = 40,724.64/x
  3. Step 3: Cross multiply
    72,561.88x = 100,129.88 × 40,724.64
  4. Step 4: Simplify right side
    72,561.88x = 4,077,753,316.24
  5. Step 5: Solve for x
    x = 4,077,753,316.24/72,561.88
  6. Step 6: Final answer
    x = 56,196.91

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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.