Home / 128,427.12-192,641.76-39,680.28

Finding the Fourth Proportional to 128,427.12, 192,641.76 and 39,680.28

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Solution

The fourth proportional to 128,427.12, 192,641.76 and 39,680.28 is: 59,520.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,427.12 : 192,641.76 = 39,680.28 : x
  2. Step 2: Convert to fraction form
    128,427.12/192,641.76 = 39,680.28/x
  3. Step 3: Cross multiply
    128,427.12x = 192,641.76 × 39,680.28
  4. Step 4: Simplify right side
    128,427.12x = 7,644,078,976.49
  5. Step 5: Solve for x
    x = 7,644,078,976.49/128,427.12
  6. Step 6: Final answer
    x = 59,520.75

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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.