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Finding the Fourth Proportional to 401.68, 553.08 and 318.52

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Solution

The fourth proportional to 401.68, 553.08 and 318.52 is: 438.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.68 : 553.08 = 318.52 : x
  2. Step 2: Convert to fraction form
    401.68/553.08 = 318.52/x
  3. Step 3: Cross multiply
    401.68x = 553.08 × 318.52
  4. Step 4: Simplify right side
    401.68x = 176,167.04
  5. Step 5: Solve for x
    x = 176,167.04/401.68
  6. Step 6: Final answer
    x = 438.58

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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.