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Finding the Fourth Proportional to 2,621.20, 3,931.92 and 889.84

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Solution

The fourth proportional to 2,621.20, 3,931.92 and 889.84 is: 1,334.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,621.20 : 3,931.92 = 889.84 : x
  2. Step 2: Convert to fraction form
    2,621.20/3,931.92 = 889.84/x
  3. Step 3: Cross multiply
    2,621.20x = 3,931.92 × 889.84
  4. Step 4: Simplify right side
    2,621.20x = 3,498,779.69
  5. Step 5: Solve for x
    x = 3,498,779.69/2,621.20
  6. Step 6: Final answer
    x = 1,334.80

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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.