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Finding the Fourth Proportional to 90,908.80, 136,314.60 and 38,258.80

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Solution

The fourth proportional to 90,908.80, 136,314.60 and 38,258.80 is: 57,367.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,908.80 : 136,314.60 = 38,258.80 : x
  2. Step 2: Convert to fraction form
    90,908.80/136,314.60 = 38,258.80/x
  3. Step 3: Cross multiply
    90,908.80x = 136,314.60 × 38,258.80
  4. Step 4: Simplify right side
    90,908.80x = 5,215,233,018.48
  5. Step 5: Solve for x
    x = 5,215,233,018.48/90,908.80
  6. Step 6: Final answer
    x = 57,367.75

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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.