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Finding the Fourth Proportional to 128,676.85, 177,569.22 and 71,317.15

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Solution

The fourth proportional to 128,676.85, 177,569.22 and 71,317.15 is: 98,414.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,676.85 : 177,569.22 = 71,317.15 : x
  2. Step 2: Convert to fraction form
    128,676.85/177,569.22 = 71,317.15/x
  3. Step 3: Cross multiply
    128,676.85x = 177,569.22 × 71,317.15
  4. Step 4: Simplify right side
    128,676.85x = 12,663,730,698.12
  5. Step 5: Solve for x
    x = 12,663,730,698.12/128,676.85
  6. Step 6: Final answer
    x = 98,414.99

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1.5x scale

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.