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Finding the Fourth Proportional to 401.08, 553.06 and 316.91

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Solution

The fourth proportional to 401.08, 553.06 and 316.91 is: 436.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.08 : 553.06 = 316.91 : x
  2. Step 2: Convert to fraction form
    401.08/553.06 = 316.91/x
  3. Step 3: Cross multiply
    401.08x = 553.06 × 316.91
  4. Step 4: Simplify right side
    401.08x = 175,265.89
  5. Step 5: Solve for x
    x = 175,265.89/401.08
  6. Step 6: Final answer
    x = 436.99

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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.