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Finding the Fourth Proportional to 315.72, 435.56 and 217.36

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Solution

The fourth proportional to 315.72, 435.56 and 217.36 is: 299.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.72 : 435.56 = 217.36 : x
  2. Step 2: Convert to fraction form
    315.72/435.56 = 217.36/x
  3. Step 3: Cross multiply
    315.72x = 435.56 × 217.36
  4. Step 4: Simplify right side
    315.72x = 94,673.32
  5. Step 5: Solve for x
    x = 94,673.32/315.72
  6. Step 6: Final answer
    x = 299.86

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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.