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Finding the Fourth Proportional to 400.72, 553.58 and 317.56

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Solution

The fourth proportional to 400.72, 553.58 and 317.56 is: 438.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.72 : 553.58 = 317.56 : x
  2. Step 2: Convert to fraction form
    400.72/553.58 = 317.56/x
  3. Step 3: Cross multiply
    400.72x = 553.58 × 317.56
  4. Step 4: Simplify right side
    400.72x = 175,794.86
  5. Step 5: Solve for x
    x = 175,794.86/400.72
  6. Step 6: Final answer
    x = 438.70

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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.