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Finding the Fourth Proportional to 91,125.80, 125,685.72 and 66,919.20

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Solution

The fourth proportional to 91,125.80, 125,685.72 and 66,919.20 is: 92,298.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,125.80 : 125,685.72 = 66,919.20 : x
  2. Step 2: Convert to fraction form
    91,125.80/125,685.72 = 66,919.20/x
  3. Step 3: Cross multiply
    91,125.80x = 125,685.72 × 66,919.20
  4. Step 4: Simplify right side
    91,125.80x = 8,410,787,833.82
  5. Step 5: Solve for x
    x = 8,410,787,833.82/91,125.80
  6. Step 6: Final answer
    x = 92,298.64

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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.