Home / 2,101.61-2,900.85-1,217.81

Finding the Fourth Proportional to 2,101.61, 2,900.85 and 1,217.81

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Solution

The fourth proportional to 2,101.61, 2,900.85 and 1,217.81 is: 1,680.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.61 : 2,900.85 = 1,217.81 : x
  2. Step 2: Convert to fraction form
    2,101.61/2,900.85 = 1,217.81/x
  3. Step 3: Cross multiply
    2,101.61x = 2,900.85 × 1,217.81
  4. Step 4: Simplify right side
    2,101.61x = 3,532,684.14
  5. Step 5: Solve for x
    x = 3,532,684.14/2,101.61
  6. Step 6: Final answer
    x = 1,680.94

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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.