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Finding the Fourth Proportional to 465.25, 641.88 and 278.80

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Solution

The fourth proportional to 465.25, 641.88 and 278.80 is: 384.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.25 : 641.88 = 278.80 : x
  2. Step 2: Convert to fraction form
    465.25/641.88 = 278.80/x
  3. Step 3: Cross multiply
    465.25x = 641.88 × 278.80
  4. Step 4: Simplify right side
    465.25x = 178,956.27
  5. Step 5: Solve for x
    x = 178,956.27/465.25
  6. Step 6: Final answer
    x = 384.65

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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.