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Finding the Fourth Proportional to 138,245.73, 207,036.45 and 78,901.50

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Solution

The fourth proportional to 138,245.73, 207,036.45 and 78,901.50 is: 118,162.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,245.73 : 207,036.45 = 78,901.50 : x
  2. Step 2: Convert to fraction form
    138,245.73/207,036.45 = 78,901.50/x
  3. Step 3: Cross multiply
    138,245.73x = 207,036.45 × 78,901.50
  4. Step 4: Simplify right side
    138,245.73x = 16,335,486,459.68
  5. Step 5: Solve for x
    x = 16,335,486,459.68/138,245.73
  6. Step 6: Final answer
    x = 118,162.68

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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.