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Finding the Fourth Proportional to 548.49, 822.20 and 259.77

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Solution

The fourth proportional to 548.49, 822.20 and 259.77 is: 389.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.49 : 822.20 = 259.77 : x
  2. Step 2: Convert to fraction form
    548.49/822.20 = 259.77/x
  3. Step 3: Cross multiply
    548.49x = 822.20 × 259.77
  4. Step 4: Simplify right side
    548.49x = 213,581.60
  5. Step 5: Solve for x
    x = 213,581.60/548.49
  6. Step 6: Final answer
    x = 389.40

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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.