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Finding the Fourth Proportional to 2,115.60, 3,172.68 and 728.70

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Solution

The fourth proportional to 2,115.60, 3,172.68 and 728.70 is: 1,092.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.60 : 3,172.68 = 728.70 : x
  2. Step 2: Convert to fraction form
    2,115.60/3,172.68 = 728.70/x
  3. Step 3: Cross multiply
    2,115.60x = 3,172.68 × 728.70
  4. Step 4: Simplify right side
    2,115.60x = 2,311,931.92
  5. Step 5: Solve for x
    x = 2,311,931.92/2,115.60
  6. Step 6: Final answer
    x = 1,092.80

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1.5x scale

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.