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Finding the Fourth Proportional to 2,620.60, 3,931.70 and 890.44

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Solution

The fourth proportional to 2,620.60, 3,931.70 and 890.44 is: 1,335.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.60 : 3,931.70 = 890.44 : x
  2. Step 2: Convert to fraction form
    2,620.60/3,931.70 = 890.44/x
  3. Step 3: Cross multiply
    2,620.60x = 3,931.70 × 890.44
  4. Step 4: Simplify right side
    2,620.60x = 3,500,942.95
  5. Step 5: Solve for x
    x = 3,500,942.95/2,620.60
  6. Step 6: Final answer
    x = 1,335.93

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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.