Home / 2,987.28-4,122.36-1,728.54

Finding the Fourth Proportional to 2,987.28, 4,122.36 and 1,728.54

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Solution

The fourth proportional to 2,987.28, 4,122.36 and 1,728.54 is: 2,385.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.28 : 4,122.36 = 1,728.54 : x
  2. Step 2: Convert to fraction form
    2,987.28/4,122.36 = 1,728.54/x
  3. Step 3: Cross multiply
    2,987.28x = 4,122.36 × 1,728.54
  4. Step 4: Simplify right side
    2,987.28x = 7,125,664.15
  5. Step 5: Solve for x
    x = 7,125,664.15/2,987.28
  6. Step 6: Final answer
    x = 2,385.34

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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.