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Finding the Fourth Proportional to 102.21, 153.14 and 80.63

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Solution

The fourth proportional to 102.21, 153.14 and 80.63 is: 120.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.21 : 153.14 = 80.63 : x
  2. Step 2: Convert to fraction form
    102.21/153.14 = 80.63/x
  3. Step 3: Cross multiply
    102.21x = 153.14 × 80.63
  4. Step 4: Simplify right side
    102.21x = 12,346.51
  5. Step 5: Solve for x
    x = 12,346.51/102.21
  6. Step 6: Final answer
    x = 120.80

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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.