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Finding the Fourth Proportional to 102.71, 155.19 and 101.72

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Solution

The fourth proportional to 102.71, 155.19 and 101.72 is: 153.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.71 : 155.19 = 101.72 : x
  2. Step 2: Convert to fraction form
    102.71/155.19 = 101.72/x
  3. Step 3: Cross multiply
    102.71x = 155.19 × 101.72
  4. Step 4: Simplify right side
    102.71x = 15,785.67
  5. Step 5: Solve for x
    x = 15,785.67/102.71
  6. Step 6: Final answer
    x = 153.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.