Home / 20,990.18-28,963.50-11,559.36

Finding the Fourth Proportional to 20,990.18, 28,963.50 and 11,559.36

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Solution

The fourth proportional to 20,990.18, 28,963.50 and 11,559.36 is: 15,950.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.18 : 28,963.50 = 11,559.36 : x
  2. Step 2: Convert to fraction form
    20,990.18/28,963.50 = 11,559.36/x
  3. Step 3: Cross multiply
    20,990.18x = 28,963.50 × 11,559.36
  4. Step 4: Simplify right side
    20,990.18x = 334,799,523.36
  5. Step 5: Solve for x
    x = 334,799,523.36/20,990.18
  6. Step 6: Final answer
    x = 15,950.29

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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.