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Finding the Fourth Proportional to 66,065.76, 99,115.92 and 38,340

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Solution

The fourth proportional to 66,065.76, 99,115.92 and 38,340 is: 57,520.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,065.76 : 99,115.92 = 38,340 : x
  2. Step 2: Convert to fraction form
    66,065.76/99,115.92 = 38,340/x
  3. Step 3: Cross multiply
    66,065.76x = 99,115.92 × 38,340
  4. Step 4: Simplify right side
    66,065.76x = 3,800,104,372.80
  5. Step 5: Solve for x
    x = 3,800,104,372.80/66,065.76
  6. Step 6: Final answer
    x = 57,520.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.