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Finding the Fourth Proportional to 102.09, 153.13 and 50.72

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Solution

The fourth proportional to 102.09, 153.13 and 50.72 is: 76.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.09 : 153.13 = 50.72 : x
  2. Step 2: Convert to fraction form
    102.09/153.13 = 50.72/x
  3. Step 3: Cross multiply
    102.09x = 153.13 × 50.72
  4. Step 4: Simplify right side
    102.09x = 7,767.48
  5. Step 5: Solve for x
    x = 7,767.48/102.09
  6. Step 6: Final answer
    x = 76.09

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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.