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Finding the Fourth Proportional to 138,042.80, 207,282.90 and 100,863.80

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Solution

The fourth proportional to 138,042.80, 207,282.90 and 100,863.80 is: 151,455.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,042.80 : 207,282.90 = 100,863.80 : x
  2. Step 2: Convert to fraction form
    138,042.80/207,282.90 = 100,863.80/x
  3. Step 3: Cross multiply
    138,042.80x = 207,282.90 × 100,863.80
  4. Step 4: Simplify right side
    138,042.80x = 20,907,340,969.02
  5. Step 5: Solve for x
    x = 20,907,340,969.02/138,042.80
  6. Step 6: Final answer
    x = 151,455.50

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1.5x scale

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.