Home / 128,376.20-192,564.30-84,139.40

Finding the Fourth Proportional to 128,376.20, 192,564.30 and 84,139.40

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Solution

The fourth proportional to 128,376.20, 192,564.30 and 84,139.40 is: 126,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,376.20 : 192,564.30 = 84,139.40 : x
  2. Step 2: Convert to fraction form
    128,376.20/192,564.30 = 84,139.40/x
  3. Step 3: Cross multiply
    128,376.20x = 192,564.30 × 84,139.40
  4. Step 4: Simplify right side
    128,376.20x = 16,202,244,663.42
  5. Step 5: Solve for x
    x = 16,202,244,663.42/128,376.20
  6. Step 6: Final answer
    x = 126,209.10

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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.