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Finding the Fourth Proportional to 77,380.88, 115,921.85 and 57,081.87

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Solution

The fourth proportional to 77,380.88, 115,921.85 and 57,081.87 is: 85,512.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,380.88 : 115,921.85 = 57,081.87 : x
  2. Step 2: Convert to fraction form
    77,380.88/115,921.85 = 57,081.87/x
  3. Step 3: Cross multiply
    77,380.88x = 115,921.85 × 57,081.87
  4. Step 4: Simplify right side
    77,380.88x = 6,617,035,686.45
  5. Step 5: Solve for x
    x = 6,617,035,686.45/77,380.88
  6. Step 6: Final answer
    x = 85,512.55

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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.