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Finding the Fourth Proportional to 2,270.40, 3,398.40 and 1,780.80

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Solution

The fourth proportional to 2,270.40, 3,398.40 and 1,780.80 is: 2,665.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,270.40 : 3,398.40 = 1,780.80 : x
  2. Step 2: Convert to fraction form
    2,270.40/3,398.40 = 1,780.80/x
  3. Step 3: Cross multiply
    2,270.40x = 3,398.40 × 1,780.80
  4. Step 4: Simplify right side
    2,270.40x = 6,051,870.72
  5. Step 5: Solve for x
    x = 6,051,870.72/2,270.40
  6. Step 6: Final answer
    x = 2,665.55

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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.