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Finding the Fourth Proportional to 102.51, 141.38 and 69.81

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Solution

The fourth proportional to 102.51, 141.38 and 69.81 is: 96.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.51 : 141.38 = 69.81 : x
  2. Step 2: Convert to fraction form
    102.51/141.38 = 69.81/x
  3. Step 3: Cross multiply
    102.51x = 141.38 × 69.81
  4. Step 4: Simplify right side
    102.51x = 9,869.39
  5. Step 5: Solve for x
    x = 9,869.39/102.51
  6. Step 6: Final answer
    x = 96.28

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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.