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Finding the Fourth Proportional to 138,861.05, 191,574 and 80,708.12

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Solution

The fourth proportional to 138,861.05, 191,574 and 80,708.12 is: 111,345.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,861.05 : 191,574 = 80,708.12 : x
  2. Step 2: Convert to fraction form
    138,861.05/191,574 = 80,708.12/x
  3. Step 3: Cross multiply
    138,861.05x = 191,574 × 80,708.12
  4. Step 4: Simplify right side
    138,861.05x = 15,461,577,859.82
  5. Step 5: Solve for x
    x = 15,461,577,859.82/138,861.05
  6. Step 6: Final answer
    x = 111,345.68

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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.