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Finding the Fourth Proportional to 315.19, 435 and 197.20

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Solution

The fourth proportional to 315.19, 435 and 197.20 is: 272.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.19 : 435 = 197.20 : x
  2. Step 2: Convert to fraction form
    315.19/435 = 197.20/x
  3. Step 3: Cross multiply
    315.19x = 435 × 197.20
  4. Step 4: Simplify right side
    315.19x = 85,782
  5. Step 5: Solve for x
    x = 85,782/315.19
  6. Step 6: Final answer
    x = 272.16

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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.