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Finding the Fourth Proportional to 399.12, 598.24 and 291.44

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Solution

The fourth proportional to 399.12, 598.24 and 291.44 is: 436.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.12 : 598.24 = 291.44 : x
  2. Step 2: Convert to fraction form
    399.12/598.24 = 291.44/x
  3. Step 3: Cross multiply
    399.12x = 598.24 × 291.44
  4. Step 4: Simplify right side
    399.12x = 174,351.07
  5. Step 5: Solve for x
    x = 174,351.07/399.12
  6. Step 6: Final answer
    x = 436.84

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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.