Home / 158,428.38-218,825.37-128,247.78

Finding the Fourth Proportional to 158,428.38, 218,825.37 and 128,247.78

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Solution

The fourth proportional to 158,428.38, 218,825.37 and 128,247.78 is: 177,139.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,428.38 : 218,825.37 = 128,247.78 : x
  2. Step 2: Convert to fraction form
    158,428.38/218,825.37 = 128,247.78/x
  3. Step 3: Cross multiply
    158,428.38x = 218,825.37 × 128,247.78
  4. Step 4: Simplify right side
    158,428.38x = 28,063,867,910.18
  5. Step 5: Solve for x
    x = 28,063,867,910.18/158,428.38
  6. Step 6: Final answer
    x = 177,139.15

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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.