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Finding the Fourth Proportional to 20,689.76, 28,532.01 and 13,899.14

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Solution

The fourth proportional to 20,689.76, 28,532.01 and 13,899.14 is: 19,167.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.76 : 28,532.01 = 13,899.14 : x
  2. Step 2: Convert to fraction form
    20,689.76/28,532.01 = 13,899.14/x
  3. Step 3: Cross multiply
    20,689.76x = 28,532.01 × 13,899.14
  4. Step 4: Simplify right side
    20,689.76x = 396,570,401.47
  5. Step 5: Solve for x
    x = 396,570,401.47/20,689.76
  6. Step 6: Final answer
    x = 19,167.47

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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.