Home / 2,117.78-2,921.64-1,331.54

Finding the Fourth Proportional to 2,117.78, 2,921.64 and 1,331.54

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Solution

The fourth proportional to 2,117.78, 2,921.64 and 1,331.54 is: 1,836.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.78 : 2,921.64 = 1,331.54 : x
  2. Step 2: Convert to fraction form
    2,117.78/2,921.64 = 1,331.54/x
  3. Step 3: Cross multiply
    2,117.78x = 2,921.64 × 1,331.54
  4. Step 4: Simplify right side
    2,117.78x = 3,890,280.53
  5. Step 5: Solve for x
    x = 3,890,280.53/2,117.78
  6. Step 6: Final answer
    x = 1,836.96

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1.5x scale

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.