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Finding the Fourth Proportional to 136,925.80, 205,388.70 and 126,428.20

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Solution

The fourth proportional to 136,925.80, 205,388.70 and 126,428.20 is: 189,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,925.80 : 205,388.70 = 126,428.20 : x
  2. Step 2: Convert to fraction form
    136,925.80/205,388.70 = 126,428.20/x
  3. Step 3: Cross multiply
    136,925.80x = 205,388.70 × 126,428.20
  4. Step 4: Simplify right side
    136,925.80x = 25,966,923,641.34
  5. Step 5: Solve for x
    x = 25,966,923,641.34/136,925.80
  6. Step 6: Final answer
    x = 189,642.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.