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Finding the Fourth Proportional to 188,959.50, 260,980.38 and 128,428.20

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Solution

The fourth proportional to 188,959.50, 260,980.38 and 128,428.20 is: 177,377.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    188,959.50 : 260,980.38 = 128,428.20 : x
  2. Step 2: Convert to fraction form
    188,959.50/260,980.38 = 128,428.20/x
  3. Step 3: Cross multiply
    188,959.50x = 260,980.38 × 128,428.20
  4. Step 4: Simplify right side
    188,959.50x = 33,517,240,438.72
  5. Step 5: Solve for x
    x = 33,517,240,438.72/188,959.50
  6. Step 6: Final answer
    x = 177,377.91

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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.