Home / 3,987.36-5,510.15-2,990.91

Finding the Fourth Proportional to 3,987.36, 5,510.15 and 2,990.91

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Solution

The fourth proportional to 3,987.36, 5,510.15 and 2,990.91 is: 4,133.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.36 : 5,510.15 = 2,990.91 : x
  2. Step 2: Convert to fraction form
    3,987.36/5,510.15 = 2,990.91/x
  3. Step 3: Cross multiply
    3,987.36x = 5,510.15 × 2,990.91
  4. Step 4: Simplify right side
    3,987.36x = 16,480,347.78
  5. Step 5: Solve for x
    x = 16,480,347.78/3,987.36
  6. Step 6: Final answer
    x = 4,133.15

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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.