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Finding the Fourth Proportional to 72,211.94, 99,652.78 and 40,380.82

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Solution

The fourth proportional to 72,211.94, 99,652.78 and 40,380.82 is: 55,725.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,211.94 : 99,652.78 = 40,380.82 : x
  2. Step 2: Convert to fraction form
    72,211.94/99,652.78 = 40,380.82/x
  3. Step 3: Cross multiply
    72,211.94x = 99,652.78 × 40,380.82
  4. Step 4: Simplify right side
    72,211.94x = 4,024,060,971.68
  5. Step 5: Solve for x
    x = 4,024,060,971.68/72,211.94
  6. Step 6: Final answer
    x = 55,725.70

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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.