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Finding the Fourth Proportional to 136,686.20, 188,347 and 100,819.40

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Solution

The fourth proportional to 136,686.20, 188,347 and 100,819.40 is: 138,924.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,686.20 : 188,347 = 100,819.40 : x
  2. Step 2: Convert to fraction form
    136,686.20/188,347 = 100,819.40/x
  3. Step 3: Cross multiply
    136,686.20x = 188,347 × 100,819.40
  4. Step 4: Simplify right side
    136,686.20x = 18,989,031,531.80
  5. Step 5: Solve for x
    x = 18,989,031,531.80/136,686.20
  6. Step 6: Final answer
    x = 138,924.28

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.