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Finding the Fourth Proportional to 1,348.11, 2,021.88 and 689.28

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Solution

The fourth proportional to 1,348.11, 2,021.88 and 689.28 is: 1,033.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,348.11 : 2,021.88 = 689.28 : x
  2. Step 2: Convert to fraction form
    1,348.11/2,021.88 = 689.28/x
  3. Step 3: Cross multiply
    1,348.11x = 2,021.88 × 689.28
  4. Step 4: Simplify right side
    1,348.11x = 1,393,641.45
  5. Step 5: Solve for x
    x = 1,393,641.45/1,348.11
  6. Step 6: Final answer
    x = 1,033.77

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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.