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Finding the Fourth Proportional to 279.43, 385.63 and 155.11

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Solution

The fourth proportional to 279.43, 385.63 and 155.11 is: 214.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.43 : 385.63 = 155.11 : x
  2. Step 2: Convert to fraction form
    279.43/385.63 = 155.11/x
  3. Step 3: Cross multiply
    279.43x = 385.63 × 155.11
  4. Step 4: Simplify right side
    279.43x = 59,813.36
  5. Step 5: Solve for x
    x = 59,813.36/279.43
  6. Step 6: Final answer
    x = 214.05

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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.