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Finding the Fourth Proportional to 689.76, 951.90 and 379.26

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Solution

The fourth proportional to 689.76, 951.90 and 379.26 is: 523.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.76 : 951.90 = 379.26 : x
  2. Step 2: Convert to fraction form
    689.76/951.90 = 379.26/x
  3. Step 3: Cross multiply
    689.76x = 951.90 × 379.26
  4. Step 4: Simplify right side
    689.76x = 361,017.59
  5. Step 5: Solve for x
    x = 361,017.59/689.76
  6. Step 6: Final answer
    x = 523.40

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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.