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Finding the Fourth Proportional to 1,620.80, 2,235.60 and 1,031.12

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Solution

The fourth proportional to 1,620.80, 2,235.60 and 1,031.12 is: 1,422.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.80 : 2,235.60 = 1,031.12 : x
  2. Step 2: Convert to fraction form
    1,620.80/2,235.60 = 1,031.12/x
  3. Step 3: Cross multiply
    1,620.80x = 2,235.60 × 1,031.12
  4. Step 4: Simplify right side
    1,620.80x = 2,305,171.87
  5. Step 5: Solve for x
    x = 2,305,171.87/1,620.80
  6. Step 6: Final answer
    x = 1,422.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.