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Finding the Fourth Proportional to 103.66, 155.48 and 48.80

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Solution

The fourth proportional to 103.66, 155.48 and 48.80 is: 73.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.66 : 155.48 = 48.80 : x
  2. Step 2: Convert to fraction form
    103.66/155.48 = 48.80/x
  3. Step 3: Cross multiply
    103.66x = 155.48 × 48.80
  4. Step 4: Simplify right side
    103.66x = 7,587.42
  5. Step 5: Solve for x
    x = 7,587.42/103.66
  6. Step 6: Final answer
    x = 73.20

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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.