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Finding the Fourth Proportional to 401.70, 554.01 and 355.11

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Solution

The fourth proportional to 401.70, 554.01 and 355.11 is: 489.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.70 : 554.01 = 355.11 : x
  2. Step 2: Convert to fraction form
    401.70/554.01 = 355.11/x
  3. Step 3: Cross multiply
    401.70x = 554.01 × 355.11
  4. Step 4: Simplify right side
    401.70x = 196,734.49
  5. Step 5: Solve for x
    x = 196,734.49/401.70
  6. Step 6: Final answer
    x = 489.75

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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.