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Finding the Fourth Proportional to 91,062.74, 125,745.89 and 57,129.56

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Solution

The fourth proportional to 91,062.74, 125,745.89 and 57,129.56 is: 78,888.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,062.74 : 125,745.89 = 57,129.56 : x
  2. Step 2: Convert to fraction form
    91,062.74/125,745.89 = 57,129.56/x
  3. Step 3: Cross multiply
    91,062.74x = 125,745.89 × 57,129.56
  4. Step 4: Simplify right side
    91,062.74x = 7,183,807,824.70
  5. Step 5: Solve for x
    x = 7,183,807,824.70/91,062.74
  6. Step 6: Final answer
    x = 78,888.55

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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.