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Finding the Fourth Proportional to 153.19, 229.78 and 39.19

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Solution

The fourth proportional to 153.19, 229.78 and 39.19 is: 58.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.19 : 229.78 = 39.19 : x
  2. Step 2: Convert to fraction form
    153.19/229.78 = 39.19/x
  3. Step 3: Cross multiply
    153.19x = 229.78 × 39.19
  4. Step 4: Simplify right side
    153.19x = 9,004.55
  5. Step 5: Solve for x
    x = 9,004.55/153.19
  6. Step 6: Final answer
    x = 58.78

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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.