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Finding the Fourth Proportional to 61,139.80, 91,709.70 and 40,363.30

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Solution

The fourth proportional to 61,139.80, 91,709.70 and 40,363.30 is: 60,544.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,139.80 : 91,709.70 = 40,363.30 : x
  2. Step 2: Convert to fraction form
    61,139.80/91,709.70 = 40,363.30/x
  3. Step 3: Cross multiply
    61,139.80x = 91,709.70 × 40,363.30
  4. Step 4: Simplify right side
    61,139.80x = 3,701,706,134.01
  5. Step 5: Solve for x
    x = 3,701,706,134.01/61,139.80
  6. Step 6: Final answer
    x = 60,544.95

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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.