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Finding the Fourth Proportional to 315.43, 435.05 and 217.15

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Solution

The fourth proportional to 315.43, 435.05 and 217.15 is: 299.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.43 : 435.05 = 217.15 : x
  2. Step 2: Convert to fraction form
    315.43/435.05 = 217.15/x
  3. Step 3: Cross multiply
    315.43x = 435.05 × 217.15
  4. Step 4: Simplify right side
    315.43x = 94,470.02
  5. Step 5: Solve for x
    x = 94,470.02/315.43
  6. Step 6: Final answer
    x = 299.50

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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.