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Finding the Fourth Proportional to 160.40, 239.30 and 140.15

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Solution

The fourth proportional to 160.40, 239.30 and 140.15 is: 209.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.40 : 239.30 = 140.15 : x
  2. Step 2: Convert to fraction form
    160.40/239.30 = 140.15/x
  3. Step 3: Cross multiply
    160.40x = 239.30 × 140.15
  4. Step 4: Simplify right side
    160.40x = 33,537.90
  5. Step 5: Solve for x
    x = 33,537.90/160.40
  6. Step 6: Final answer
    x = 209.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.