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Finding the Fourth Proportional to 72,170.52, 99,595.98 and 39,904.68

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Solution

The fourth proportional to 72,170.52, 99,595.98 and 39,904.68 is: 55,068.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,170.52 : 99,595.98 = 39,904.68 : x
  2. Step 2: Convert to fraction form
    72,170.52/99,595.98 = 39,904.68/x
  3. Step 3: Cross multiply
    72,170.52x = 99,595.98 × 39,904.68
  4. Step 4: Simplify right side
    72,170.52x = 3,974,345,711.19
  5. Step 5: Solve for x
    x = 3,974,345,711.19/72,170.52
  6. Step 6: Final answer
    x = 55,068.82

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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.