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Finding the Fourth Proportional to 138,002.60, 207,003.90 and 100,386.20

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Solution

The fourth proportional to 138,002.60, 207,003.90 and 100,386.20 is: 150,579.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,002.60 : 207,003.90 = 100,386.20 : x
  2. Step 2: Convert to fraction form
    138,002.60/207,003.90 = 100,386.20/x
  3. Step 3: Cross multiply
    138,002.60x = 207,003.90 × 100,386.20
  4. Step 4: Simplify right side
    138,002.60x = 20,780,334,906.18
  5. Step 5: Solve for x
    x = 20,780,334,906.18/138,002.60
  6. Step 6: Final answer
    x = 150,579.30

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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.