Home / 128,780.21-177,680.45-101,471.60

Finding the Fourth Proportional to 128,780.21, 177,680.45 and 101,471.60

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Solution

The fourth proportional to 128,780.21, 177,680.45 and 101,471.60 is: 140,002.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,780.21 : 177,680.45 = 101,471.60 : x
  2. Step 2: Convert to fraction form
    128,780.21/177,680.45 = 101,471.60/x
  3. Step 3: Cross multiply
    128,780.21x = 177,680.45 × 101,471.60
  4. Step 4: Simplify right side
    128,780.21x = 18,029,520,248.10
  5. Step 5: Solve for x
    x = 18,029,520,248.10/128,780.21
  6. Step 6: Final answer
    x = 140,002.26

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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.