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Finding the Fourth Proportional to 220,718.40, 330,847.20 and 120,724.80

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Solution

The fourth proportional to 220,718.40, 330,847.20 and 120,724.80 is: 180,961.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,718.40 : 330,847.20 = 120,724.80 : x
  2. Step 2: Convert to fraction form
    220,718.40/330,847.20 = 120,724.80/x
  3. Step 3: Cross multiply
    220,718.40x = 330,847.20 × 120,724.80
  4. Step 4: Simplify right side
    220,718.40x = 39,941,462,050.56
  5. Step 5: Solve for x
    x = 39,941,462,050.56/220,718.40
  6. Step 6: Final answer
    x = 180,961.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.