Home / 128,498.18-177,328.85-71,138.43

Finding the Fourth Proportional to 128,498.18, 177,328.85 and 71,138.43

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Solution

The fourth proportional to 128,498.18, 177,328.85 and 71,138.43 is: 98,171.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,498.18 : 177,328.85 = 71,138.43 : x
  2. Step 2: Convert to fraction form
    128,498.18/177,328.85 = 71,138.43/x
  3. Step 3: Cross multiply
    128,498.18x = 177,328.85 × 71,138.43
  4. Step 4: Simplify right side
    128,498.18x = 12,614,895,627.01
  5. Step 5: Solve for x
    x = 12,614,895,627.01/128,498.18
  6. Step 6: Final answer
    x = 98,171.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.