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Finding the Fourth Proportional to 2,188.40, 3,281.64 and 889.52

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Solution

The fourth proportional to 2,188.40, 3,281.64 and 889.52 is: 1,333.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188.40 : 3,281.64 = 889.52 : x
  2. Step 2: Convert to fraction form
    2,188.40/3,281.64 = 889.52/x
  3. Step 3: Cross multiply
    2,188.40x = 3,281.64 × 889.52
  4. Step 4: Simplify right side
    2,188.40x = 2,919,084.41
  5. Step 5: Solve for x
    x = 2,919,084.41/2,188.40
  6. Step 6: Final answer
    x = 1,333.89

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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.