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Finding the Fourth Proportional to 315.38, 435.34 and 228.31

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Solution

The fourth proportional to 315.38, 435.34 and 228.31 is: 315.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.38 : 435.34 = 228.31 : x
  2. Step 2: Convert to fraction form
    315.38/435.34 = 228.31/x
  3. Step 3: Cross multiply
    315.38x = 435.34 × 228.31
  4. Step 4: Simplify right side
    315.38x = 99,391.67
  5. Step 5: Solve for x
    x = 99,391.67/315.38
  6. Step 6: Final answer
    x = 315.15

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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.