Home / 11,987.52-17,990.70-8,315.59

Finding the Fourth Proportional to 11,987.52, 17,990.70 and 8,315.59

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Solution

The fourth proportional to 11,987.52, 17,990.70 and 8,315.59 is: 12,479.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,987.52 : 17,990.70 = 8,315.59 : x
  2. Step 2: Convert to fraction form
    11,987.52/17,990.70 = 8,315.59/x
  3. Step 3: Cross multiply
    11,987.52x = 17,990.70 × 8,315.59
  4. Step 4: Simplify right side
    11,987.52x = 149,603,153.48
  5. Step 5: Solve for x
    x = 149,603,153.48/11,987.52
  6. Step 6: Final answer
    x = 12,479.91

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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.