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Finding the Fourth Proportional to 20,969.62, 28,938.18 and 11,538.16

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Solution

The fourth proportional to 20,969.62, 28,938.18 and 11,538.16 is: 15,922.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.62 : 28,938.18 = 11,538.16 : x
  2. Step 2: Convert to fraction form
    20,969.62/28,938.18 = 11,538.16/x
  3. Step 3: Cross multiply
    20,969.62x = 28,938.18 × 11,538.16
  4. Step 4: Simplify right side
    20,969.62x = 333,893,350.95
  5. Step 5: Solve for x
    x = 333,893,350.95/20,969.62
  6. Step 6: Final answer
    x = 15,922.72

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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.