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Finding the Fourth Proportional to 103.50, 155.60 and 73.20

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Solution

The fourth proportional to 103.50, 155.60 and 73.20 is: 110.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.50 : 155.60 = 73.20 : x
  2. Step 2: Convert to fraction form
    103.50/155.60 = 73.20/x
  3. Step 3: Cross multiply
    103.50x = 155.60 × 73.20
  4. Step 4: Simplify right side
    103.50x = 11,389.92
  5. Step 5: Solve for x
    x = 11,389.92/103.50
  6. Step 6: Final answer
    x = 110.05

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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.