Home / 20,987.46-28,961.82-11,555.82

Finding the Fourth Proportional to 20,987.46, 28,961.82 and 11,555.82

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Solution

The fourth proportional to 20,987.46, 28,961.82 and 11,555.82 is: 15,946.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.46 : 28,961.82 = 11,555.82 : x
  2. Step 2: Convert to fraction form
    20,987.46/28,961.82 = 11,555.82/x
  3. Step 3: Cross multiply
    20,987.46x = 28,961.82 × 11,555.82
  4. Step 4: Simplify right side
    20,987.46x = 334,677,578.79
  5. Step 5: Solve for x
    x = 334,677,578.79/20,987.46
  6. Step 6: Final answer
    x = 15,946.55

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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.