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Finding the Fourth Proportional to 61,129.80, 91,748.70 and 36,138.60

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Solution

The fourth proportional to 61,129.80, 91,748.70 and 36,138.60 is: 54,239.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,129.80 : 91,748.70 = 36,138.60 : x
  2. Step 2: Convert to fraction form
    61,129.80/91,748.70 = 36,138.60/x
  3. Step 3: Cross multiply
    61,129.80x = 91,748.70 × 36,138.60
  4. Step 4: Simplify right side
    61,129.80x = 3,315,669,569.82
  5. Step 5: Solve for x
    x = 3,315,669,569.82/61,129.80
  6. Step 6: Final answer
    x = 54,239.82

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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.