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Finding the Fourth Proportional to 689.22, 951.22 and 630.90

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Solution

The fourth proportional to 689.22, 951.22 and 630.90 is: 870.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.22 : 951.22 = 630.90 : x
  2. Step 2: Convert to fraction form
    689.22/951.22 = 630.90/x
  3. Step 3: Cross multiply
    689.22x = 951.22 × 630.90
  4. Step 4: Simplify right side
    689.22x = 600,124.70
  5. Step 5: Solve for x
    x = 600,124.70/689.22
  6. Step 6: Final answer
    x = 870.73

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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.