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Finding the Fourth Proportional to 279.10, 385.16 and 153.06

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Solution

The fourth proportional to 279.10, 385.16 and 153.06 is: 211.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.10 : 385.16 = 153.06 : x
  2. Step 2: Convert to fraction form
    279.10/385.16 = 153.06/x
  3. Step 3: Cross multiply
    279.10x = 385.16 × 153.06
  4. Step 4: Simplify right side
    279.10x = 58,951.19
  5. Step 5: Solve for x
    x = 58,951.19/279.10
  6. Step 6: Final answer
    x = 211.22

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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.