Home / 2,155.95-3,231.13-905.12

Finding the Fourth Proportional to 2,155.95, 3,231.13 and 905.12

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Solution

The fourth proportional to 2,155.95, 3,231.13 and 905.12 is: 1,356.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.95 : 3,231.13 = 905.12 : x
  2. Step 2: Convert to fraction form
    2,155.95/3,231.13 = 905.12/x
  3. Step 3: Cross multiply
    2,155.95x = 3,231.13 × 905.12
  4. Step 4: Simplify right side
    2,155.95x = 2,924,576.50
  5. Step 5: Solve for x
    x = 2,924,576.50/2,155.95
  6. Step 6: Final answer
    x = 1,356.51

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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.