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Finding the Fourth Proportional to 91,908.32, 137,980.54 and 70,861.73

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Solution

The fourth proportional to 91,908.32, 137,980.54 and 70,861.73 is: 106,383.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,908.32 : 137,980.54 = 70,861.73 : x
  2. Step 2: Convert to fraction form
    91,908.32/137,980.54 = 70,861.73/x
  3. Step 3: Cross multiply
    91,908.32x = 137,980.54 × 70,861.73
  4. Step 4: Simplify right side
    91,908.32x = 9,777,539,657.13
  5. Step 5: Solve for x
    x = 9,777,539,657.13/91,908.32
  6. Step 6: Final answer
    x = 106,383.62

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1.5x scale

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.