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Finding the Fourth Proportional to 315.61, 435.51 and 197.56

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Solution

The fourth proportional to 315.61, 435.51 and 197.56 is: 272.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.61 : 435.51 = 197.56 : x
  2. Step 2: Convert to fraction form
    315.61/435.51 = 197.56/x
  3. Step 3: Cross multiply
    315.61x = 435.51 × 197.56
  4. Step 4: Simplify right side
    315.61x = 86,039.36
  5. Step 5: Solve for x
    x = 86,039.36/315.61
  6. Step 6: Final answer
    x = 272.61

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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.