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Finding the Fourth Proportional to 220,425.20, 330,200.40 and 120,438.80

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Solution

The fourth proportional to 220,425.20, 330,200.40 and 120,438.80 is: 180,419.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,425.20 : 330,200.40 = 120,438.80 : x
  2. Step 2: Convert to fraction form
    220,425.20/330,200.40 = 120,438.80/x
  3. Step 3: Cross multiply
    220,425.20x = 330,200.40 × 120,438.80
  4. Step 4: Simplify right side
    220,425.20x = 39,768,939,935.52
  5. Step 5: Solve for x
    x = 39,768,939,935.52/220,425.20
  6. Step 6: Final answer
    x = 180,419.21

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1.5x scale

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.