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Finding the Fourth Proportional to 401.80, 553.94 and 319.18

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Solution

The fourth proportional to 401.80, 553.94 and 319.18 is: 440.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.80 : 553.94 = 319.18 : x
  2. Step 2: Convert to fraction form
    401.80/553.94 = 319.18/x
  3. Step 3: Cross multiply
    401.80x = 553.94 × 319.18
  4. Step 4: Simplify right side
    401.80x = 176,806.57
  5. Step 5: Solve for x
    x = 176,806.57/401.80
  6. Step 6: Final answer
    x = 440.04

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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.