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Finding the Fourth Proportional to 138,325.20, 207,487.80 and 85,837.20

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Solution

The fourth proportional to 138,325.20, 207,487.80 and 85,837.20 is: 128,755.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,325.20 : 207,487.80 = 85,837.20 : x
  2. Step 2: Convert to fraction form
    138,325.20/207,487.80 = 85,837.20/x
  3. Step 3: Cross multiply
    138,325.20x = 207,487.80 × 85,837.20
  4. Step 4: Simplify right side
    138,325.20x = 17,810,171,786.16
  5. Step 5: Solve for x
    x = 17,810,171,786.16/138,325.20
  6. Step 6: Final answer
    x = 128,755.80

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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.