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Finding the Fourth Proportional to 689.92, 951.78 and 469.06

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Solution

The fourth proportional to 689.92, 951.78 and 469.06 is: 647.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.92 : 951.78 = 469.06 : x
  2. Step 2: Convert to fraction form
    689.92/951.78 = 469.06/x
  3. Step 3: Cross multiply
    689.92x = 951.78 × 469.06
  4. Step 4: Simplify right side
    689.92x = 446,441.93
  5. Step 5: Solve for x
    x = 446,441.93/689.92
  6. Step 6: Final answer
    x = 647.09

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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.