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Finding the Fourth Proportional to 401.51, 553.80 and 261.75

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Solution

The fourth proportional to 401.51, 553.80 and 261.75 is: 361.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.51 : 553.80 = 261.75 : x
  2. Step 2: Convert to fraction form
    401.51/553.80 = 261.75/x
  3. Step 3: Cross multiply
    401.51x = 553.80 × 261.75
  4. Step 4: Simplify right side
    401.51x = 144,957.15
  5. Step 5: Solve for x
    x = 144,957.15/401.51
  6. Step 6: Final answer
    x = 361.03

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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.