Home / 7,987.12-11,981.02-2,143.70

Finding the Fourth Proportional to 7,987.12, 11,981.02 and 2,143.70

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Solution

The fourth proportional to 7,987.12, 11,981.02 and 2,143.70 is: 3,215.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.12 : 11,981.02 = 2,143.70 : x
  2. Step 2: Convert to fraction form
    7,987.12/11,981.02 = 2,143.70/x
  3. Step 3: Cross multiply
    7,987.12x = 11,981.02 × 2,143.70
  4. Step 4: Simplify right side
    7,987.12x = 25,683,712.57
  5. Step 5: Solve for x
    x = 25,683,712.57/7,987.12
  6. Step 6: Final answer
    x = 3,215.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.