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Finding the Fourth Proportional to 128,422.70, 192,634.05 and 89,024.30

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Solution

The fourth proportional to 128,422.70, 192,634.05 and 89,024.30 is: 133,536.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.70 : 192,634.05 = 89,024.30 : x
  2. Step 2: Convert to fraction form
    128,422.70/192,634.05 = 89,024.30/x
  3. Step 3: Cross multiply
    128,422.70x = 192,634.05 × 89,024.30
  4. Step 4: Simplify right side
    128,422.70x = 17,149,111,457.42
  5. Step 5: Solve for x
    x = 17,149,111,457.42/128,422.70
  6. Step 6: Final answer
    x = 133,536.45

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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.