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Finding the Fourth Proportional to 72,145.80, 99,560.97 and 40,314.69

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Solution

The fourth proportional to 72,145.80, 99,560.97 and 40,314.69 is: 55,634.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,145.80 : 99,560.97 = 40,314.69 : x
  2. Step 2: Convert to fraction form
    72,145.80/99,560.97 = 40,314.69/x
  3. Step 3: Cross multiply
    72,145.80x = 99,560.97 × 40,314.69
  4. Step 4: Simplify right side
    72,145.80x = 4,013,769,641.65
  5. Step 5: Solve for x
    x = 4,013,769,641.65/72,145.80
  6. Step 6: Final answer
    x = 55,634.14

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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.