Home / 2,017.78-2,785.08-1,387.78

Finding the Fourth Proportional to 2,017.78, 2,785.08 and 1,387.78

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Solution

The fourth proportional to 2,017.78, 2,785.08 and 1,387.78 is: 1,915.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,017.78 : 2,785.08 = 1,387.78 : x
  2. Step 2: Convert to fraction form
    2,017.78/2,785.08 = 1,387.78/x
  3. Step 3: Cross multiply
    2,017.78x = 2,785.08 × 1,387.78
  4. Step 4: Simplify right side
    2,017.78x = 3,865,078.32
  5. Step 5: Solve for x
    x = 3,865,078.32/2,017.78
  6. Step 6: Final answer
    x = 1,915.51

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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.