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Finding the Fourth Proportional to 100,958.30, 151,437.45 and 81,275.30

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Solution

The fourth proportional to 100,958.30, 151,437.45 and 81,275.30 is: 121,912.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,958.30 : 151,437.45 = 81,275.30 : x
  2. Step 2: Convert to fraction form
    100,958.30/151,437.45 = 81,275.30/x
  3. Step 3: Cross multiply
    100,958.30x = 151,437.45 × 81,275.30
  4. Step 4: Simplify right side
    100,958.30x = 12,308,124,179.99
  5. Step 5: Solve for x
    x = 12,308,124,179.99/100,958.30
  6. Step 6: Final answer
    x = 121,912.95

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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.