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Finding the Fourth Proportional to 339.40, 475.80 and 339.40

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Solution

The fourth proportional to 339.40, 475.80 and 339.40 is: 475.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.40 : 475.80 = 339.40 : x
  2. Step 2: Convert to fraction form
    339.40/475.80 = 339.40/x
  3. Step 3: Cross multiply
    339.40x = 475.80 × 339.40
  4. Step 4: Simplify right side
    339.40x = 161,486.52
  5. Step 5: Solve for x
    x = 161,486.52/339.40
  6. Step 6: Final answer
    x = 475.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.