Home / 2,125.89-3,186.81-891.86

Finding the Fourth Proportional to 2,125.89, 3,186.81 and 891.86

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Solution

The fourth proportional to 2,125.89, 3,186.81 and 891.86 is: 1,336.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.89 : 3,186.81 = 891.86 : x
  2. Step 2: Convert to fraction form
    2,125.89/3,186.81 = 891.86/x
  3. Step 3: Cross multiply
    2,125.89x = 3,186.81 × 891.86
  4. Step 4: Simplify right side
    2,125.89x = 2,842,172.43
  5. Step 5: Solve for x
    x = 2,842,172.43/2,125.89
  6. Step 6: Final answer
    x = 1,336.93

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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.