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Finding the Fourth Proportional to 339.68, 509.40 and 144.68

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Solution

The fourth proportional to 339.68, 509.40 and 144.68 is: 216.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.68 : 509.40 = 144.68 : x
  2. Step 2: Convert to fraction form
    339.68/509.40 = 144.68/x
  3. Step 3: Cross multiply
    339.68x = 509.40 × 144.68
  4. Step 4: Simplify right side
    339.68x = 73,699.99
  5. Step 5: Solve for x
    x = 73,699.99/339.68
  6. Step 6: Final answer
    x = 216.97

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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.