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Finding the Fourth Proportional to 279.61, 385.87 and 155.29

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Solution

The fourth proportional to 279.61, 385.87 and 155.29 is: 214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.61 : 385.87 = 155.29 : x
  2. Step 2: Convert to fraction form
    279.61/385.87 = 155.29/x
  3. Step 3: Cross multiply
    279.61x = 385.87 × 155.29
  4. Step 4: Simplify right side
    279.61x = 59,920.66
  5. Step 5: Solve for x
    x = 59,920.66/279.61
  6. Step 6: Final answer
    x = 214.30

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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.