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Finding the Fourth Proportional to 315.78, 435.53 and 197.65

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Solution

The fourth proportional to 315.78, 435.53 and 197.65 is: 272.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.78 : 435.53 = 197.65 : x
  2. Step 2: Convert to fraction form
    315.78/435.53 = 197.65/x
  3. Step 3: Cross multiply
    315.78x = 435.53 × 197.65
  4. Step 4: Simplify right side
    315.78x = 86,081.21
  5. Step 5: Solve for x
    x = 86,081.21/315.78
  6. Step 6: Final answer
    x = 272.60

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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.