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Finding the Fourth Proportional to 138,998.79, 191,694.47 and 108,379.40

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Solution

The fourth proportional to 138,998.79, 191,694.47 and 108,379.40 is: 149,466.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,998.79 : 191,694.47 = 108,379.40 : x
  2. Step 2: Convert to fraction form
    138,998.79/191,694.47 = 108,379.40/x
  3. Step 3: Cross multiply
    138,998.79x = 191,694.47 × 108,379.40
  4. Step 4: Simplify right side
    138,998.79x = 20,775,730,141.55
  5. Step 5: Solve for x
    x = 20,775,730,141.55/138,998.79
  6. Step 6: Final answer
    x = 149,466.99

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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.