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Finding the Fourth Proportional to 72,171.64, 99,592.84 and 39,904.39

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Solution

The fourth proportional to 72,171.64, 99,592.84 and 39,904.39 is: 55,065.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,171.64 : 99,592.84 = 39,904.39 : x
  2. Step 2: Convert to fraction form
    72,171.64/99,592.84 = 39,904.39/x
  3. Step 3: Cross multiply
    72,171.64x = 99,592.84 × 39,904.39
  4. Step 4: Simplify right side
    72,171.64x = 3,974,191,528.57
  5. Step 5: Solve for x
    x = 3,974,191,528.57/72,171.64
  6. Step 6: Final answer
    x = 55,065.83

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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.