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Finding the Fourth Proportional to 128,412.70, 192,619.05 and 86,422.30

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Solution

The fourth proportional to 128,412.70, 192,619.05 and 86,422.30 is: 129,633.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,412.70 : 192,619.05 = 86,422.30 : x
  2. Step 2: Convert to fraction form
    128,412.70/192,619.05 = 86,422.30/x
  3. Step 3: Cross multiply
    128,412.70x = 192,619.05 × 86,422.30
  4. Step 4: Simplify right side
    128,412.70x = 16,646,581,324.82
  5. Step 5: Solve for x
    x = 16,646,581,324.82/128,412.70
  6. Step 6: Final answer
    x = 129,633.45

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Similar ratio
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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.