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Finding the Fourth Proportional to 61,310.80, 91,944.60 and 21,869.20

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Solution

The fourth proportional to 61,310.80, 91,944.60 and 21,869.20 is: 32,796.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,310.80 : 91,944.60 = 21,869.20 : x
  2. Step 2: Convert to fraction form
    61,310.80/91,944.60 = 21,869.20/x
  3. Step 3: Cross multiply
    61,310.80x = 91,944.60 × 21,869.20
  4. Step 4: Simplify right side
    61,310.80x = 2,010,754,846.32
  5. Step 5: Solve for x
    x = 2,010,754,846.32/61,310.80
  6. Step 6: Final answer
    x = 32,796.10

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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.