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Finding the Fourth Proportional to 401.56, 553.03 and 318.33

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Solution

The fourth proportional to 401.56, 553.03 and 318.33 is: 438.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.56 : 553.03 = 318.33 : x
  2. Step 2: Convert to fraction form
    401.56/553.03 = 318.33/x
  3. Step 3: Cross multiply
    401.56x = 553.03 × 318.33
  4. Step 4: Simplify right side
    401.56x = 176,045.24
  5. Step 5: Solve for x
    x = 176,045.24/401.56
  6. Step 6: Final answer
    x = 438.41

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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.