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Finding the Fourth Proportional to 221,443.75, 305,608.80 and 125,981.20

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Solution

The fourth proportional to 221,443.75, 305,608.80 and 125,981.20 is: 173,863.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,443.75 : 305,608.80 = 125,981.20 : x
  2. Step 2: Convert to fraction form
    221,443.75/305,608.80 = 125,981.20/x
  3. Step 3: Cross multiply
    221,443.75x = 305,608.80 × 125,981.20
  4. Step 4: Simplify right side
    221,443.75x = 38,500,963,354.56
  5. Step 5: Solve for x
    x = 38,500,963,354.56/221,443.75
  6. Step 6: Final answer
    x = 173,863.40

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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.