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Finding the Fourth Proportional to 90,422.80, 135,634.20 and 85,814.80

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Solution

The fourth proportional to 90,422.80, 135,634.20 and 85,814.80 is: 128,722.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,422.80 : 135,634.20 = 85,814.80 : x
  2. Step 2: Convert to fraction form
    90,422.80/135,634.20 = 85,814.80/x
  3. Step 3: Cross multiply
    90,422.80x = 135,634.20 × 85,814.80
  4. Step 4: Simplify right side
    90,422.80x = 11,639,421,746.16
  5. Step 5: Solve for x
    x = 11,639,421,746.16/90,422.80
  6. Step 6: Final answer
    x = 128,722.20

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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.