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Finding the Fourth Proportional to 66,609.31, 99,912.55 and 21,630.62

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Solution

The fourth proportional to 66,609.31, 99,912.55 and 21,630.62 is: 32,445.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,609.31 : 99,912.55 = 21,630.62 : x
  2. Step 2: Convert to fraction form
    66,609.31/99,912.55 = 21,630.62/x
  3. Step 3: Cross multiply
    66,609.31x = 99,912.55 × 21,630.62
  4. Step 4: Simplify right side
    66,609.31x = 2,161,170,402.28
  5. Step 5: Solve for x
    x = 2,161,170,402.28/66,609.31
  6. Step 6: Final answer
    x = 32,445.47

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1.5x scale

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.