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Finding the Fourth Proportional to 102.66, 153.72 and 72.06

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Solution

The fourth proportional to 102.66, 153.72 and 72.06 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.66 : 153.72 = 72.06 : x
  2. Step 2: Convert to fraction form
    102.66/153.72 = 72.06/x
  3. Step 3: Cross multiply
    102.66x = 153.72 × 72.06
  4. Step 4: Simplify right side
    102.66x = 11,077.06
  5. Step 5: Solve for x
    x = 11,077.06/102.66
  6. Step 6: Final answer
    x = 107.90

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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.