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Finding the Fourth Proportional to 72,519.94, 100,077.42 and 40,691.80

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Solution

The fourth proportional to 72,519.94, 100,077.42 and 40,691.80 is: 56,154.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,519.94 : 100,077.42 = 40,691.80 : x
  2. Step 2: Convert to fraction form
    72,519.94/100,077.42 = 40,691.80/x
  3. Step 3: Cross multiply
    72,519.94x = 100,077.42 × 40,691.80
  4. Step 4: Simplify right side
    72,519.94x = 4,072,330,359.16
  5. Step 5: Solve for x
    x = 4,072,330,359.16/72,519.94
  6. Step 6: Final answer
    x = 56,154.63

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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.