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Finding the Fourth Proportional to 319.16, 440.34 and 202.79

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Solution

The fourth proportional to 319.16, 440.34 and 202.79 is: 279.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.16 : 440.34 = 202.79 : x
  2. Step 2: Convert to fraction form
    319.16/440.34 = 202.79/x
  3. Step 3: Cross multiply
    319.16x = 440.34 × 202.79
  4. Step 4: Simplify right side
    319.16x = 89,296.89
  5. Step 5: Solve for x
    x = 89,296.89/319.16
  6. Step 6: Final answer
    x = 279.79

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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.