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Finding the Fourth Proportional to 72,115.87, 99,520.71 and 39,850.35

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Solution

The fourth proportional to 72,115.87, 99,520.71 and 39,850.35 is: 54,993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,115.87 : 99,520.71 = 39,850.35 : x
  2. Step 2: Convert to fraction form
    72,115.87/99,520.71 = 39,850.35/x
  3. Step 3: Cross multiply
    72,115.87x = 99,520.71 × 39,850.35
  4. Step 4: Simplify right side
    72,115.87x = 3,965,934,926.50
  5. Step 5: Solve for x
    x = 3,965,934,926.50/72,115.87
  6. Step 6: Final answer
    x = 54,993.93

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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.