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Finding the Fourth Proportional to 279.12, 384.99 and 168.40

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Solution

The fourth proportional to 279.12, 384.99 and 168.40 is: 232.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.12 : 384.99 = 168.40 : x
  2. Step 2: Convert to fraction form
    279.12/384.99 = 168.40/x
  3. Step 3: Cross multiply
    279.12x = 384.99 × 168.40
  4. Step 4: Simplify right side
    279.12x = 64,832.80
  5. Step 5: Solve for x
    x = 64,832.80/279.12
  6. Step 6: Final answer
    x = 232.28

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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.