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Finding the Fourth Proportional to 91,091.39, 125,641.04 and 78,970.20

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Solution

The fourth proportional to 91,091.39, 125,641.04 and 78,970.20 is: 108,922.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,091.39 : 125,641.04 = 78,970.20 : x
  2. Step 2: Convert to fraction form
    91,091.39/125,641.04 = 78,970.20/x
  3. Step 3: Cross multiply
    91,091.39x = 125,641.04 × 78,970.20
  4. Step 4: Simplify right side
    91,091.39x = 9,921,898,254.43
  5. Step 5: Solve for x
    x = 9,921,898,254.43/91,091.39
  6. Step 6: Final answer
    x = 108,922.46

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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.