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Finding the Fourth Proportional to 400.98, 553.19 and 261.15

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Solution

The fourth proportional to 400.98, 553.19 and 261.15 is: 360.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.98 : 553.19 = 261.15 : x
  2. Step 2: Convert to fraction form
    400.98/553.19 = 261.15/x
  3. Step 3: Cross multiply
    400.98x = 553.19 × 261.15
  4. Step 4: Simplify right side
    400.98x = 144,464.26
  5. Step 5: Solve for x
    x = 144,464.26/400.98
  6. Step 6: Final answer
    x = 360.28

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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.