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Finding the Fourth Proportional to 138,003.70, 207,005.55 and 84,859.60

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Solution

The fourth proportional to 138,003.70, 207,005.55 and 84,859.60 is: 127,289.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,003.70 : 207,005.55 = 84,859.60 : x
  2. Step 2: Convert to fraction form
    138,003.70/207,005.55 = 84,859.60/x
  3. Step 3: Cross multiply
    138,003.70x = 207,005.55 × 84,859.60
  4. Step 4: Simplify right side
    138,003.70x = 17,566,408,170.78
  5. Step 5: Solve for x
    x = 17,566,408,170.78/138,003.70
  6. Step 6: Final answer
    x = 127,289.40

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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.