Home / 2,115.09-3,172.65-945.15

Finding the Fourth Proportional to 2,115.09, 3,172.65 and 945.15

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Solution

The fourth proportional to 2,115.09, 3,172.65 and 945.15 is: 1,417.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.09 : 3,172.65 = 945.15 : x
  2. Step 2: Convert to fraction form
    2,115.09/3,172.65 = 945.15/x
  3. Step 3: Cross multiply
    2,115.09x = 3,172.65 × 945.15
  4. Step 4: Simplify right side
    2,115.09x = 2,998,630.15
  5. Step 5: Solve for x
    x = 2,998,630.15/2,115.09
  6. Step 6: Final answer
    x = 1,417.73

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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.