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Finding the Fourth Proportional to 551.98, 828.20 and 278.25

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Solution

The fourth proportional to 551.98, 828.20 and 278.25 is: 417.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.98 : 828.20 = 278.25 : x
  2. Step 2: Convert to fraction form
    551.98/828.20 = 278.25/x
  3. Step 3: Cross multiply
    551.98x = 828.20 × 278.25
  4. Step 4: Simplify right side
    551.98x = 230,446.65
  5. Step 5: Solve for x
    x = 230,446.65/551.98
  6. Step 6: Final answer
    x = 417.49

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.