Home / 2,987.04-4,122.12-1,660.78

Finding the Fourth Proportional to 2,987.04, 4,122.12 and 1,660.78

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Solution

The fourth proportional to 2,987.04, 4,122.12 and 1,660.78 is: 2,291.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.04 : 4,122.12 = 1,660.78 : x
  2. Step 2: Convert to fraction form
    2,987.04/4,122.12 = 1,660.78/x
  3. Step 3: Cross multiply
    2,987.04x = 4,122.12 × 1,660.78
  4. Step 4: Simplify right side
    2,987.04x = 6,845,934.45
  5. Step 5: Solve for x
    x = 6,845,934.45/2,987.04
  6. Step 6: Final answer
    x = 2,291.88

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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.