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Finding the Fourth Proportional to 399.18, 550.80 and 233.40

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Solution

The fourth proportional to 399.18, 550.80 and 233.40 is: 322.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.18 : 550.80 = 233.40 : x
  2. Step 2: Convert to fraction form
    399.18/550.80 = 233.40/x
  3. Step 3: Cross multiply
    399.18x = 550.80 × 233.40
  4. Step 4: Simplify right side
    399.18x = 128,556.72
  5. Step 5: Solve for x
    x = 128,556.72/399.18
  6. Step 6: Final answer
    x = 322.05

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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.