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Finding the Fourth Proportional to 399.40, 550.02 and 388.36

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Solution

The fourth proportional to 399.40, 550.02 and 388.36 is: 534.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.40 : 550.02 = 388.36 : x
  2. Step 2: Convert to fraction form
    399.40/550.02 = 388.36/x
  3. Step 3: Cross multiply
    399.40x = 550.02 × 388.36
  4. Step 4: Simplify right side
    399.40x = 213,605.77
  5. Step 5: Solve for x
    x = 213,605.77/399.40
  6. Step 6: Final answer
    x = 534.82

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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.