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Finding the Fourth Proportional to 72,116.92, 99,521.11 and 39,850.64

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Solution

The fourth proportional to 72,116.92, 99,521.11 and 39,850.64 is: 54,993.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,116.92 : 99,521.11 = 39,850.64 : x
  2. Step 2: Convert to fraction form
    72,116.92/99,521.11 = 39,850.64/x
  3. Step 3: Cross multiply
    72,116.92x = 99,521.11 × 39,850.64
  4. Step 4: Simplify right side
    72,116.92x = 3,965,979,727.76
  5. Step 5: Solve for x
    x = 3,965,979,727.76/72,116.92
  6. Step 6: Final answer
    x = 54,993.75

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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.