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Finding the Fourth Proportional to 689.25, 951.21 and 427.44

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Solution

The fourth proportional to 689.25, 951.21 and 427.44 is: 589.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.25 : 951.21 = 427.44 : x
  2. Step 2: Convert to fraction form
    689.25/951.21 = 427.44/x
  3. Step 3: Cross multiply
    689.25x = 951.21 × 427.44
  4. Step 4: Simplify right side
    689.25x = 406,585.20
  5. Step 5: Solve for x
    x = 406,585.20/689.25
  6. Step 6: Final answer
    x = 589.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.