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Finding the Fourth Proportional to 279.37, 385.91 and 202.15

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Solution

The fourth proportional to 279.37, 385.91 and 202.15 is: 279.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.37 : 385.91 = 202.15 : x
  2. Step 2: Convert to fraction form
    279.37/385.91 = 202.15/x
  3. Step 3: Cross multiply
    279.37x = 385.91 × 202.15
  4. Step 4: Simplify right side
    279.37x = 78,011.71
  5. Step 5: Solve for x
    x = 78,011.71/279.37
  6. Step 6: Final answer
    x = 279.24

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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.