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Finding the Fourth Proportional to 400.76, 553.16 and 245.76

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Solution

The fourth proportional to 400.76, 553.16 and 245.76 is: 339.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.76 : 553.16 = 245.76 : x
  2. Step 2: Convert to fraction form
    400.76/553.16 = 245.76/x
  3. Step 3: Cross multiply
    400.76x = 553.16 × 245.76
  4. Step 4: Simplify right side
    400.76x = 135,944.60
  5. Step 5: Solve for x
    x = 135,944.60/400.76
  6. Step 6: Final answer
    x = 339.22

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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.