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Finding the Fourth Proportional to 400.84, 553.11 and 253.21

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Solution

The fourth proportional to 400.84, 553.11 and 253.21 is: 349.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.84 : 553.11 = 253.21 : x
  2. Step 2: Convert to fraction form
    400.84/553.11 = 253.21/x
  3. Step 3: Cross multiply
    400.84x = 553.11 × 253.21
  4. Step 4: Simplify right side
    400.84x = 140,052.98
  5. Step 5: Solve for x
    x = 140,052.98/400.84
  6. Step 6: Final answer
    x = 349.40

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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.