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Finding the Fourth Proportional to 401.95, 553.00 and 354.46

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Solution

The fourth proportional to 401.95, 553.00 and 354.46 is: 487.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.95 : 553.00 = 354.46 : x
  2. Step 2: Convert to fraction form
    401.95/553.00 = 354.46/x
  3. Step 3: Cross multiply
    401.95x = 553.00 × 354.46
  4. Step 4: Simplify right side
    401.95x = 196,019.14
  5. Step 5: Solve for x
    x = 196,019.14/401.95
  6. Step 6: Final answer
    x = 487.68

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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.