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Finding the Fourth Proportional to 401.10, 553.21 and 261.26

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Solution

The fourth proportional to 401.10, 553.21 and 261.26 is: 360.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.10 : 553.21 = 261.26 : x
  2. Step 2: Convert to fraction form
    401.10/553.21 = 261.26/x
  3. Step 3: Cross multiply
    401.10x = 553.21 × 261.26
  4. Step 4: Simplify right side
    401.10x = 144,533.41
  5. Step 5: Solve for x
    x = 144,533.41/401.10
  6. Step 6: Final answer
    x = 360.34

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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.