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Finding the Fourth Proportional to 138,325.60, 207,682.80 and 85,837.60

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Solution

The fourth proportional to 138,325.60, 207,682.80 and 85,837.60 is: 128,877.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,325.60 : 207,682.80 = 85,837.60 : x
  2. Step 2: Convert to fraction form
    138,325.60/207,682.80 = 85,837.60/x
  3. Step 3: Cross multiply
    138,325.60x = 207,682.80 × 85,837.60
  4. Step 4: Simplify right side
    138,325.60x = 17,826,993,113.28
  5. Step 5: Solve for x
    x = 17,826,993,113.28/138,325.60
  6. Step 6: Final answer
    x = 128,877.03

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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.