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Finding the Fourth Proportional to 339.90, 508.77 and 311.55

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Solution

The fourth proportional to 339.90, 508.77 and 311.55 is: 466.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.90 : 508.77 = 311.55 : x
  2. Step 2: Convert to fraction form
    339.90/508.77 = 311.55/x
  3. Step 3: Cross multiply
    339.90x = 508.77 × 311.55
  4. Step 4: Simplify right side
    339.90x = 158,507.29
  5. Step 5: Solve for x
    x = 158,507.29/339.90
  6. Step 6: Final answer
    x = 466.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.