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Finding the Fourth Proportional to 153.67, 212.01 and 87.28

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Solution

The fourth proportional to 153.67, 212.01 and 87.28 is: 120.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.67 : 212.01 = 87.28 : x
  2. Step 2: Convert to fraction form
    153.67/212.01 = 87.28/x
  3. Step 3: Cross multiply
    153.67x = 212.01 × 87.28
  4. Step 4: Simplify right side
    153.67x = 18,503.39
  5. Step 5: Solve for x
    x = 18,503.39/153.67
  6. Step 6: Final answer
    x = 120.41

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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.