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Finding the Fourth Proportional to 103.68, 155.20 and 71.08

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Solution

The fourth proportional to 103.68, 155.20 and 71.08 is: 106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.68 : 155.20 = 71.08 : x
  2. Step 2: Convert to fraction form
    103.68/155.20 = 71.08/x
  3. Step 3: Cross multiply
    103.68x = 155.20 × 71.08
  4. Step 4: Simplify right side
    103.68x = 11,031.62
  5. Step 5: Solve for x
    x = 11,031.62/103.68
  6. Step 6: Final answer
    x = 106.40

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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.