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Finding the Fourth Proportional to 239.70, 359.90 and 148.78

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Solution

The fourth proportional to 239.70, 359.90 and 148.78 is: 223.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.70 : 359.90 = 148.78 : x
  2. Step 2: Convert to fraction form
    239.70/359.90 = 148.78/x
  3. Step 3: Cross multiply
    239.70x = 359.90 × 148.78
  4. Step 4: Simplify right side
    239.70x = 53,545.92
  5. Step 5: Solve for x
    x = 53,545.92/239.70
  6. Step 6: Final answer
    x = 223.39

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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.