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Finding the Fourth Proportional to 66,609.01, 99,911.20 and 16,689.53

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Solution

The fourth proportional to 66,609.01, 99,911.20 and 16,689.53 is: 25,033.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,609.01 : 99,911.20 = 16,689.53 : x
  2. Step 2: Convert to fraction form
    66,609.01/99,911.20 = 16,689.53/x
  3. Step 3: Cross multiply
    66,609.01x = 99,911.20 × 16,689.53
  4. Step 4: Simplify right side
    66,609.01x = 1,667,470,969.74
  5. Step 5: Solve for x
    x = 1,667,470,969.74/66,609.01
  6. Step 6: Final answer
    x = 25,033.71

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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.