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Finding the Fourth Proportional to 553.44, 830.17 and 431.81

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Solution

The fourth proportional to 553.44, 830.17 and 431.81 is: 647.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.44 : 830.17 = 431.81 : x
  2. Step 2: Convert to fraction form
    553.44/830.17 = 431.81/x
  3. Step 3: Cross multiply
    553.44x = 830.17 × 431.81
  4. Step 4: Simplify right side
    553.44x = 358,472.78
  5. Step 5: Solve for x
    x = 358,472.78/553.44
  6. Step 6: Final answer
    x = 647.71

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Double scale
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Similar ratio
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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.