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Finding the Fourth Proportional to 138,403.20, 207,259.20 and 91,401.60

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Solution

The fourth proportional to 138,403.20, 207,259.20 and 91,401.60 is: 136,874.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,403.20 : 207,259.20 = 91,401.60 : x
  2. Step 2: Convert to fraction form
    138,403.20/207,259.20 = 91,401.60/x
  3. Step 3: Cross multiply
    138,403.20x = 207,259.20 × 91,401.60
  4. Step 4: Simplify right side
    138,403.20x = 18,943,822,494.72
  5. Step 5: Solve for x
    x = 18,943,822,494.72/138,403.20
  6. Step 6: Final answer
    x = 136,874.17

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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.