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Finding the Fourth Proportional to 279.64, 385.84 and 176.16

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Solution

The fourth proportional to 279.64, 385.84 and 176.16 is: 243.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.64 : 385.84 = 176.16 : x
  2. Step 2: Convert to fraction form
    279.64/385.84 = 176.16/x
  3. Step 3: Cross multiply
    279.64x = 385.84 × 176.16
  4. Step 4: Simplify right side
    279.64x = 67,969.57
  5. Step 5: Solve for x
    x = 67,969.57/279.64
  6. Step 6: Final answer
    x = 243.06

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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.