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Finding the Fourth Proportional to 161.16, 239.91 and 153.30

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Solution

The fourth proportional to 161.16, 239.91 and 153.30 is: 228.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.16 : 239.91 = 153.30 : x
  2. Step 2: Convert to fraction form
    161.16/239.91 = 153.30/x
  3. Step 3: Cross multiply
    161.16x = 239.91 × 153.30
  4. Step 4: Simplify right side
    161.16x = 36,778.20
  5. Step 5: Solve for x
    x = 36,778.20/161.16
  6. Step 6: Final answer
    x = 228.21

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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.