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Finding the Fourth Proportional to 279.57, 385.81 and 155.23

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Solution

The fourth proportional to 279.57, 385.81 and 155.23 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.57 : 385.81 = 155.23 : x
  2. Step 2: Convert to fraction form
    279.57/385.81 = 155.23/x
  3. Step 3: Cross multiply
    279.57x = 385.81 × 155.23
  4. Step 4: Simplify right side
    279.57x = 59,887.06
  5. Step 5: Solve for x
    x = 59,887.06/279.57
  6. Step 6: Final answer
    x = 214.21

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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.