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Finding the Fourth Proportional to 339.49, 509.28 and 156.93

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Solution

The fourth proportional to 339.49, 509.28 and 156.93 is: 235.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.49 : 509.28 = 156.93 : x
  2. Step 2: Convert to fraction form
    339.49/509.28 = 156.93/x
  3. Step 3: Cross multiply
    339.49x = 509.28 × 156.93
  4. Step 4: Simplify right side
    339.49x = 79,921.31
  5. Step 5: Solve for x
    x = 79,921.31/339.49
  6. Step 6: Final answer
    x = 235.42

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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.