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Finding the Fourth Proportional to 553.16, 828.48 and 398.60

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Solution

The fourth proportional to 553.16, 828.48 and 398.60 is: 596.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.16 : 828.48 = 398.60 : x
  2. Step 2: Convert to fraction form
    553.16/828.48 = 398.60/x
  3. Step 3: Cross multiply
    553.16x = 828.48 × 398.60
  4. Step 4: Simplify right side
    553.16x = 330,232.13
  5. Step 5: Solve for x
    x = 330,232.13/553.16
  6. Step 6: Final answer
    x = 596.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.