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Finding the Fourth Proportional to 61,213.70, 91,820.55 and 21,815.30

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Solution

The fourth proportional to 61,213.70, 91,820.55 and 21,815.30 is: 32,722.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,213.70 : 91,820.55 = 21,815.30 : x
  2. Step 2: Convert to fraction form
    61,213.70/91,820.55 = 21,815.30/x
  3. Step 3: Cross multiply
    61,213.70x = 91,820.55 × 21,815.30
  4. Step 4: Simplify right side
    61,213.70x = 2,003,092,844.42
  5. Step 5: Solve for x
    x = 2,003,092,844.42/61,213.70
  6. Step 6: Final answer
    x = 32,722.95

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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.