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Finding the Fourth Proportional to 72,171.30, 99,591.86 and 39,905.09

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Solution

The fourth proportional to 72,171.30, 99,591.86 and 39,905.09 is: 55,066.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,171.30 : 99,591.86 = 39,905.09 : x
  2. Step 2: Convert to fraction form
    72,171.30/99,591.86 = 39,905.09/x
  3. Step 3: Cross multiply
    72,171.30x = 99,591.86 × 39,905.09
  4. Step 4: Simplify right side
    72,171.30x = 3,974,221,439.08
  5. Step 5: Solve for x
    x = 3,974,221,439.08/72,171.30
  6. Step 6: Final answer
    x = 55,066.51

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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.