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Finding the Fourth Proportional to 399.33, 550.70 and 315.14

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Solution

The fourth proportional to 399.33, 550.70 and 315.14 is: 434.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.33 : 550.70 = 315.14 : x
  2. Step 2: Convert to fraction form
    399.33/550.70 = 315.14/x
  3. Step 3: Cross multiply
    399.33x = 550.70 × 315.14
  4. Step 4: Simplify right side
    399.33x = 173,547.55
  5. Step 5: Solve for x
    x = 173,547.55/399.33
  6. Step 6: Final answer
    x = 434.60

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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.