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Finding the Fourth Proportional to 401.16, 553.32 and 290.64

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Solution

The fourth proportional to 401.16, 553.32 and 290.64 is: 400.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.16 : 553.32 = 290.64 : x
  2. Step 2: Convert to fraction form
    401.16/553.32 = 290.64/x
  3. Step 3: Cross multiply
    401.16x = 553.32 × 290.64
  4. Step 4: Simplify right side
    401.16x = 160,816.92
  5. Step 5: Solve for x
    x = 160,816.92/401.16
  6. Step 6: Final answer
    x = 400.88

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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.