Home / 128,633.90-177,458.20-77,618.18

Finding the Fourth Proportional to 128,633.90, 177,458.20 and 77,618.18

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Solution

The fourth proportional to 128,633.90, 177,458.20 and 77,618.18 is: 107,078.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,633.90 : 177,458.20 = 77,618.18 : x
  2. Step 2: Convert to fraction form
    128,633.90/177,458.20 = 77,618.18/x
  3. Step 3: Cross multiply
    128,633.90x = 177,458.20 × 77,618.18
  4. Step 4: Simplify right side
    128,633.90x = 13,773,982,759.68
  5. Step 5: Solve for x
    x = 13,773,982,759.68/128,633.90
  6. Step 6: Final answer
    x = 107,078.95

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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.