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Finding the Fourth Proportional to 418,867.20, 628,300.80 and 219,110.40

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Solution

The fourth proportional to 418,867.20, 628,300.80 and 219,110.40 is: 328,665.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,867.20 : 628,300.80 = 219,110.40 : x
  2. Step 2: Convert to fraction form
    418,867.20/628,300.80 = 219,110.40/x
  3. Step 3: Cross multiply
    418,867.20x = 628,300.80 × 219,110.40
  4. Step 4: Simplify right side
    418,867.20x = 137,667,239,608.32
  5. Step 5: Solve for x
    x = 137,667,239,608.32/418,867.20
  6. Step 6: Final answer
    x = 328,665.60

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Similar ratio
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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.