Home / 20,988.72-28,963.80-11,428.20

Finding the Fourth Proportional to 20,988.72, 28,963.80 and 11,428.20

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Solution

The fourth proportional to 20,988.72, 28,963.80 and 11,428.20 is: 15,770.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.72 : 28,963.80 = 11,428.20 : x
  2. Step 2: Convert to fraction form
    20,988.72/28,963.80 = 11,428.20/x
  3. Step 3: Cross multiply
    20,988.72x = 28,963.80 × 11,428.20
  4. Step 4: Simplify right side
    20,988.72x = 331,004,099.16
  5. Step 5: Solve for x
    x = 331,004,099.16/20,988.72
  6. Step 6: Final answer
    x = 15,770.57

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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.