Home / 2,755.16-4,129.84-905.78

Finding the Fourth Proportional to 2,755.16, 4,129.84 and 905.78

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Solution

The fourth proportional to 2,755.16, 4,129.84 and 905.78 is: 1,357.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,755.16 : 4,129.84 = 905.78 : x
  2. Step 2: Convert to fraction form
    2,755.16/4,129.84 = 905.78/x
  3. Step 3: Cross multiply
    2,755.16x = 4,129.84 × 905.78
  4. Step 4: Simplify right side
    2,755.16x = 3,740,726.48
  5. Step 5: Solve for x
    x = 3,740,726.48/2,755.16
  6. Step 6: Final answer
    x = 1,357.72

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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.