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Finding the Fourth Proportional to 689.21, 1,033.46 and 278.23

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Solution

The fourth proportional to 689.21, 1,033.46 and 278.23 is: 417.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.21 : 1,033.46 = 278.23 : x
  2. Step 2: Convert to fraction form
    689.21/1,033.46 = 278.23/x
  3. Step 3: Cross multiply
    689.21x = 1,033.46 × 278.23
  4. Step 4: Simplify right side
    689.21x = 287,535.60
  5. Step 5: Solve for x
    x = 287,535.60/689.21
  6. Step 6: Final answer
    x = 417.20

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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.