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Finding the Fourth Proportional to 91,170, 125,819.52 and 53,456.40

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Solution

The fourth proportional to 91,170, 125,819.52 and 53,456.40 is: 73,772.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,170 : 125,819.52 = 53,456.40 : x
  2. Step 2: Convert to fraction form
    91,170/125,819.52 = 53,456.40/x
  3. Step 3: Cross multiply
    91,170x = 125,819.52 × 53,456.40
  4. Step 4: Simplify right side
    91,170x = 6,725,858,588.93
  5. Step 5: Solve for x
    x = 6,725,858,588.93/91,170
  6. Step 6: Final answer
    x = 73,772.72

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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.