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Finding the Fourth Proportional to 319.10, 438.90 and 294.80

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Solution

The fourth proportional to 319.10, 438.90 and 294.80 is: 405.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.10 : 438.90 = 294.80 : x
  2. Step 2: Convert to fraction form
    319.10/438.90 = 294.80/x
  3. Step 3: Cross multiply
    319.10x = 438.90 × 294.80
  4. Step 4: Simplify right side
    319.10x = 129,387.72
  5. Step 5: Solve for x
    x = 129,387.72/319.10
  6. Step 6: Final answer
    x = 405.48

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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.