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Finding the Fourth Proportional to 279.91, 386.51 and 197.20

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Solution

The fourth proportional to 279.91, 386.51 and 197.20 is: 272.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.91 : 386.51 = 197.20 : x
  2. Step 2: Convert to fraction form
    279.91/386.51 = 197.20/x
  3. Step 3: Cross multiply
    279.91x = 386.51 × 197.20
  4. Step 4: Simplify right side
    279.91x = 76,219.77
  5. Step 5: Solve for x
    x = 76,219.77/279.91
  6. Step 6: Final answer
    x = 272.30

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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.