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Finding the Fourth Proportional to 401.98, 553.37 and 348.79

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Solution

The fourth proportional to 401.98, 553.37 and 348.79 is: 480.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.98 : 553.37 = 348.79 : x
  2. Step 2: Convert to fraction form
    401.98/553.37 = 348.79/x
  3. Step 3: Cross multiply
    401.98x = 553.37 × 348.79
  4. Step 4: Simplify right side
    401.98x = 193,009.92
  5. Step 5: Solve for x
    x = 193,009.92/401.98
  6. Step 6: Final answer
    x = 480.15

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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.