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Finding the Fourth Proportional to 161.64, 242.16 and 89.28

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Solution

The fourth proportional to 161.64, 242.16 and 89.28 is: 133.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.64 : 242.16 = 89.28 : x
  2. Step 2: Convert to fraction form
    161.64/242.16 = 89.28/x
  3. Step 3: Cross multiply
    161.64x = 242.16 × 89.28
  4. Step 4: Simplify right side
    161.64x = 21,620.04
  5. Step 5: Solve for x
    x = 21,620.04/161.64
  6. Step 6: Final answer
    x = 133.75

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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.