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Finding the Fourth Proportional to 138,401.20, 207,256.20 and 91,399.60

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Solution

The fourth proportional to 138,401.20, 207,256.20 and 91,399.60 is: 136,871.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,401.20 : 207,256.20 = 91,399.60 : x
  2. Step 2: Convert to fraction form
    138,401.20/207,256.20 = 91,399.60/x
  3. Step 3: Cross multiply
    138,401.20x = 207,256.20 × 91,399.60
  4. Step 4: Simplify right side
    138,401.20x = 18,943,133,777.52
  5. Step 5: Solve for x
    x = 18,943,133,777.52/138,401.20
  6. Step 6: Final answer
    x = 136,871.17

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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.