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Finding the Fourth Proportional to 71,778.60, 99,041.06 and 39,947.48

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Solution

The fourth proportional to 71,778.60, 99,041.06 and 39,947.48 is: 55,120.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,778.60 : 99,041.06 = 39,947.48 : x
  2. Step 2: Convert to fraction form
    71,778.60/99,041.06 = 39,947.48/x
  3. Step 3: Cross multiply
    71,778.60x = 99,041.06 × 39,947.48
  4. Step 4: Simplify right side
    71,778.60x = 3,956,440,763.53
  5. Step 5: Solve for x
    x = 3,956,440,763.53/71,778.60
  6. Step 6: Final answer
    x = 55,120.06

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1.5x scale

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.