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Finding the Fourth Proportional to 689.25, 951.26 and 479.31

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Solution

The fourth proportional to 689.25, 951.26 and 479.31 is: 661.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.25 : 951.26 = 479.31 : x
  2. Step 2: Convert to fraction form
    689.25/951.26 = 479.31/x
  3. Step 3: Cross multiply
    689.25x = 951.26 × 479.31
  4. Step 4: Simplify right side
    689.25x = 455,948.43
  5. Step 5: Solve for x
    x = 455,948.43/689.25
  6. Step 6: Final answer
    x = 661.51

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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.