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Finding the Fourth Proportional to 72,189.84, 99,619.92 and 40,357.92

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Solution

The fourth proportional to 72,189.84, 99,619.92 and 40,357.92 is: 55,692.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,189.84 : 99,619.92 = 40,357.92 : x
  2. Step 2: Convert to fraction form
    72,189.84/99,619.92 = 40,357.92/x
  3. Step 3: Cross multiply
    72,189.84x = 99,619.92 × 40,357.92
  4. Step 4: Simplify right side
    72,189.84x = 4,020,452,761.77
  5. Step 5: Solve for x
    x = 4,020,452,761.77/72,189.84
  6. Step 6: Final answer
    x = 55,692.78

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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.