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Finding the Fourth Proportional to 689.75, 951.95 and 479.81

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Solution

The fourth proportional to 689.75, 951.95 and 479.81 is: 662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.75 : 951.95 = 479.81 : x
  2. Step 2: Convert to fraction form
    689.75/951.95 = 479.81/x
  3. Step 3: Cross multiply
    689.75x = 951.95 × 479.81
  4. Step 4: Simplify right side
    689.75x = 456,755.13
  5. Step 5: Solve for x
    x = 456,755.13/689.75
  6. Step 6: Final answer
    x = 662.20

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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.