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Finding the Fourth Proportional to 61,805.87, 85,260.71 and 39,106.61

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Solution

The fourth proportional to 61,805.87, 85,260.71 and 39,106.61 is: 53,947.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,805.87 : 85,260.71 = 39,106.61 : x
  2. Step 2: Convert to fraction form
    61,805.87/85,260.71 = 39,106.61/x
  3. Step 3: Cross multiply
    61,805.87x = 85,260.71 × 39,106.61
  4. Step 4: Simplify right side
    61,805.87x = 3,334,257,138.76
  5. Step 5: Solve for x
    x = 3,334,257,138.76/61,805.87
  6. Step 6: Final answer
    x = 53,947.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.