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Finding the Fourth Proportional to 399.40, 599.45 and 277.75

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Solution

The fourth proportional to 399.40, 599.45 and 277.75 is: 416.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.40 : 599.45 = 277.75 : x
  2. Step 2: Convert to fraction form
    399.40/599.45 = 277.75/x
  3. Step 3: Cross multiply
    399.40x = 599.45 × 277.75
  4. Step 4: Simplify right side
    399.40x = 166,497.24
  5. Step 5: Solve for x
    x = 166,497.24/399.40
  6. Step 6: Final answer
    x = 416.87

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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.