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Finding the Fourth Proportional to 315.96, 435.78 and 233.40

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Solution

The fourth proportional to 315.96, 435.78 and 233.40 is: 321.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.96 : 435.78 = 233.40 : x
  2. Step 2: Convert to fraction form
    315.96/435.78 = 233.40/x
  3. Step 3: Cross multiply
    315.96x = 435.78 × 233.40
  4. Step 4: Simplify right side
    315.96x = 101,711.05
  5. Step 5: Solve for x
    x = 101,711.05/315.96
  6. Step 6: Final answer
    x = 321.91

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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.