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Finding the Fourth Proportional to 90,805.32, 136,310.04 and 38,259

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Solution

The fourth proportional to 90,805.32, 136,310.04 and 38,259 is: 57,431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,805.32 : 136,310.04 = 38,259 : x
  2. Step 2: Convert to fraction form
    90,805.32/136,310.04 = 38,259/x
  3. Step 3: Cross multiply
    90,805.32x = 136,310.04 × 38,259
  4. Step 4: Simplify right side
    90,805.32x = 5,215,085,820.36
  5. Step 5: Solve for x
    x = 5,215,085,820.36/90,805.32
  6. Step 6: Final answer
    x = 57,431.50

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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.