Home / 128,340.45-177,100.83-74,621.66

Finding the Fourth Proportional to 128,340.45, 177,100.83 and 74,621.66

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Solution

The fourth proportional to 128,340.45, 177,100.83 and 74,621.66 is: 102,972.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,340.45 : 177,100.83 = 74,621.66 : x
  2. Step 2: Convert to fraction form
    128,340.45/177,100.83 = 74,621.66/x
  3. Step 3: Cross multiply
    128,340.45x = 177,100.83 × 74,621.66
  4. Step 4: Simplify right side
    128,340.45x = 13,215,557,036.47
  5. Step 5: Solve for x
    x = 13,215,557,036.47/128,340.45
  6. Step 6: Final answer
    x = 102,972.66

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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.