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Finding the Fourth Proportional to 102.71, 141.38 and 78.07

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Solution

The fourth proportional to 102.71, 141.38 and 78.07 is: 107.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.71 : 141.38 = 78.07 : x
  2. Step 2: Convert to fraction form
    102.71/141.38 = 78.07/x
  3. Step 3: Cross multiply
    102.71x = 141.38 × 78.07
  4. Step 4: Simplify right side
    102.71x = 11,036.83
  5. Step 5: Solve for x
    x = 11,036.83/102.71
  6. Step 6: Final answer
    x = 107.46

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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.