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Finding the Fourth Proportional to 161.13, 222.36 and 87.45

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Solution

The fourth proportional to 161.13, 222.36 and 87.45 is: 120.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.13 : 222.36 = 87.45 : x
  2. Step 2: Convert to fraction form
    161.13/222.36 = 87.45/x
  3. Step 3: Cross multiply
    161.13x = 222.36 × 87.45
  4. Step 4: Simplify right side
    161.13x = 19,446.07
  5. Step 5: Solve for x
    x = 19,446.07/161.13
  6. Step 6: Final answer
    x = 120.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.