Home / 20,987.85-28,964.30-11,913.85

Finding the Fourth Proportional to 20,987.85, 28,964.30 and 11,913.85

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Solution

The fourth proportional to 20,987.85, 28,964.30 and 11,913.85 is: 16,441.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.85 : 28,964.30 = 11,913.85 : x
  2. Step 2: Convert to fraction form
    20,987.85/28,964.30 = 11,913.85/x
  3. Step 3: Cross multiply
    20,987.85x = 28,964.30 × 11,913.85
  4. Step 4: Simplify right side
    20,987.85x = 345,076,265.99
  5. Step 5: Solve for x
    x = 345,076,265.99/20,987.85
  6. Step 6: Final answer
    x = 16,441.72

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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.