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Finding the Fourth Proportional to 401.12, 553.36 and 283.26

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Solution

The fourth proportional to 401.12, 553.36 and 283.26 is: 390.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.12 : 553.36 = 283.26 : x
  2. Step 2: Convert to fraction form
    401.12/553.36 = 283.26/x
  3. Step 3: Cross multiply
    401.12x = 553.36 × 283.26
  4. Step 4: Simplify right side
    401.12x = 156,743.34
  5. Step 5: Solve for x
    x = 156,743.34/401.12
  6. Step 6: Final answer
    x = 390.77

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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.