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Finding the Fourth Proportional to 153.68, 212.03 and 87.28

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Solution

The fourth proportional to 153.68, 212.03 and 87.28 is: 120.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.68 : 212.03 = 87.28 : x
  2. Step 2: Convert to fraction form
    153.68/212.03 = 87.28/x
  3. Step 3: Cross multiply
    153.68x = 212.03 × 87.28
  4. Step 4: Simplify right side
    153.68x = 18,506.07
  5. Step 5: Solve for x
    x = 18,506.07/153.68
  6. Step 6: Final answer
    x = 120.42

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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.