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Finding the Fourth Proportional to 138,871.40, 191,523.30 and 108,609.80

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Solution

The fourth proportional to 138,871.40, 191,523.30 and 108,609.80 is: 149,788.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,871.40 : 191,523.30 = 108,609.80 : x
  2. Step 2: Convert to fraction form
    138,871.40/191,523.30 = 108,609.80/x
  3. Step 3: Cross multiply
    138,871.40x = 191,523.30 × 108,609.80
  4. Step 4: Simplify right side
    138,871.40x = 20,801,307,308.34
  5. Step 5: Solve for x
    x = 20,801,307,308.34/138,871.40
  6. Step 6: Final answer
    x = 149,788.27

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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.