Home / 2,815.66-3,885.85-1,869.78

Finding the Fourth Proportional to 2,815.66, 3,885.85 and 1,869.78

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Solution

The fourth proportional to 2,815.66, 3,885.85 and 1,869.78 is: 2,580.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.66 : 3,885.85 = 1,869.78 : x
  2. Step 2: Convert to fraction form
    2,815.66/3,885.85 = 1,869.78/x
  3. Step 3: Cross multiply
    2,815.66x = 3,885.85 × 1,869.78
  4. Step 4: Simplify right side
    2,815.66x = 7,265,684.61
  5. Step 5: Solve for x
    x = 7,265,684.61/2,815.66
  6. Step 6: Final answer
    x = 2,580.46

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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.