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Finding the Fourth Proportional to 102.15, 153.30 and 71.76

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Solution

The fourth proportional to 102.15, 153.30 and 71.76 is: 107.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.15 : 153.30 = 71.76 : x
  2. Step 2: Convert to fraction form
    102.15/153.30 = 71.76/x
  3. Step 3: Cross multiply
    102.15x = 153.30 × 71.76
  4. Step 4: Simplify right side
    102.15x = 11,000.81
  5. Step 5: Solve for x
    x = 11,000.81/102.15
  6. Step 6: Final answer
    x = 107.69

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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.