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Finding the Fourth Proportional to 102.42, 153.68 and 84.51

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Solution

The fourth proportional to 102.42, 153.68 and 84.51 is: 126.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.42 : 153.68 = 84.51 : x
  2. Step 2: Convert to fraction form
    102.42/153.68 = 84.51/x
  3. Step 3: Cross multiply
    102.42x = 153.68 × 84.51
  4. Step 4: Simplify right side
    102.42x = 12,987.50
  5. Step 5: Solve for x
    x = 12,987.50/102.42
  6. Step 6: Final answer
    x = 126.81

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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.