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Finding the Fourth Proportional to 138,866.40, 191,516.40 and 108,604.80

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Solution

The fourth proportional to 138,866.40, 191,516.40 and 108,604.80 is: 149,781.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,866.40 : 191,516.40 = 108,604.80 : x
  2. Step 2: Convert to fraction form
    138,866.40/191,516.40 = 108,604.80/x
  3. Step 3: Cross multiply
    138,866.40x = 191,516.40 × 108,604.80
  4. Step 4: Simplify right side
    138,866.40x = 20,799,600,318.72
  5. Step 5: Solve for x
    x = 20,799,600,318.72/138,866.40
  6. Step 6: Final answer
    x = 149,781.37

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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.