Home / 2,987.78-4,126.28-1,871.33

Finding the Fourth Proportional to 2,987.78, 4,126.28 and 1,871.33

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Solution

The fourth proportional to 2,987.78, 4,126.28 and 1,871.33 is: 2,584.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.78 : 4,126.28 = 1,871.33 : x
  2. Step 2: Convert to fraction form
    2,987.78/4,126.28 = 1,871.33/x
  3. Step 3: Cross multiply
    2,987.78x = 4,126.28 × 1,871.33
  4. Step 4: Simplify right side
    2,987.78x = 7,721,601.56
  5. Step 5: Solve for x
    x = 7,721,601.56/2,987.78
  6. Step 6: Final answer
    x = 2,584.40

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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.