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Finding the Fourth Proportional to 400.37, 547.76 and 398.64

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Solution

The fourth proportional to 400.37, 547.76 and 398.64 is: 545.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.37 : 547.76 = 398.64 : x
  2. Step 2: Convert to fraction form
    400.37/547.76 = 398.64/x
  3. Step 3: Cross multiply
    400.37x = 547.76 × 398.64
  4. Step 4: Simplify right side
    400.37x = 218,362.10
  5. Step 5: Solve for x
    x = 218,362.10/400.37
  6. Step 6: Final answer
    x = 545.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.