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Finding the Fourth Proportional to 399.11, 596.25 and 391.01

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Solution

The fourth proportional to 399.11, 596.25 and 391.01 is: 584.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.11 : 596.25 = 391.01 : x
  2. Step 2: Convert to fraction form
    399.11/596.25 = 391.01/x
  3. Step 3: Cross multiply
    399.11x = 596.25 × 391.01
  4. Step 4: Simplify right side
    399.11x = 233,136.73
  5. Step 5: Solve for x
    x = 233,136.73/399.11
  6. Step 6: Final answer
    x = 584.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.