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Finding the Fourth Proportional to 279.91, 386.28 and 155.59

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Solution

The fourth proportional to 279.91, 386.28 and 155.59 is: 214.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.91 : 386.28 = 155.59 : x
  2. Step 2: Convert to fraction form
    279.91/386.28 = 155.59/x
  3. Step 3: Cross multiply
    279.91x = 386.28 × 155.59
  4. Step 4: Simplify right side
    279.91x = 60,101.31
  5. Step 5: Solve for x
    x = 60,101.31/279.91
  6. Step 6: Final answer
    x = 214.72

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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.