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Finding the Fourth Proportional to 72,615.52, 100,211.12 and 40,786.72

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Solution

The fourth proportional to 72,615.52, 100,211.12 and 40,786.72 is: 56,286.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,615.52 : 100,211.12 = 40,786.72 : x
  2. Step 2: Convert to fraction form
    72,615.52/100,211.12 = 40,786.72/x
  3. Step 3: Cross multiply
    72,615.52x = 100,211.12 × 40,786.72
  4. Step 4: Simplify right side
    72,615.52x = 4,087,282,892.33
  5. Step 5: Solve for x
    x = 4,087,282,892.33/72,615.52
  6. Step 6: Final answer
    x = 56,286.63

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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.