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Finding the Fourth Proportional to 548.91, 823.37 and 431.05

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Solution

The fourth proportional to 548.91, 823.37 and 431.05 is: 646.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.91 : 823.37 = 431.05 : x
  2. Step 2: Convert to fraction form
    548.91/823.37 = 431.05/x
  3. Step 3: Cross multiply
    548.91x = 823.37 × 431.05
  4. Step 4: Simplify right side
    548.91x = 354,913.64
  5. Step 5: Solve for x
    x = 354,913.64/548.91
  6. Step 6: Final answer
    x = 646.58

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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.