Home / 221,280.82-305,321.76-129,382.40

Finding the Fourth Proportional to 221,280.82, 305,321.76 and 129,382.40

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Solution

The fourth proportional to 221,280.82, 305,321.76 and 129,382.40 is: 178,520.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,280.82 : 305,321.76 = 129,382.40 : x
  2. Step 2: Convert to fraction form
    221,280.82/305,321.76 = 129,382.40/x
  3. Step 3: Cross multiply
    221,280.82x = 305,321.76 × 129,382.40
  4. Step 4: Simplify right side
    221,280.82x = 39,503,262,844.33
  5. Step 5: Solve for x
    x = 39,503,262,844.33/221,280.82
  6. Step 6: Final answer
    x = 178,520.95

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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.