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Finding the Fourth Proportional to 61,146.80, 91,720.20 and 21,707.90

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Solution

The fourth proportional to 61,146.80, 91,720.20 and 21,707.90 is: 32,561.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,146.80 : 91,720.20 = 21,707.90 : x
  2. Step 2: Convert to fraction form
    61,146.80/91,720.20 = 21,707.90/x
  3. Step 3: Cross multiply
    61,146.80x = 91,720.20 × 21,707.90
  4. Step 4: Simplify right side
    61,146.80x = 1,991,052,929.58
  5. Step 5: Solve for x
    x = 1,991,052,929.58/61,146.80
  6. Step 6: Final answer
    x = 32,561.85

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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.