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Finding the Fourth Proportional to 401.36, 553.91 and 291.20

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Solution

The fourth proportional to 401.36, 553.91 and 291.20 is: 401.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.36 : 553.91 = 291.20 : x
  2. Step 2: Convert to fraction form
    401.36/553.91 = 291.20/x
  3. Step 3: Cross multiply
    401.36x = 553.91 × 291.20
  4. Step 4: Simplify right side
    401.36x = 161,294.37
  5. Step 5: Solve for x
    x = 161,294.37/401.36
  6. Step 6: Final answer
    x = 401.87

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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.