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Finding the Fourth Proportional to 20,911.90, 28,899.90 and 17,129.07

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Solution

The fourth proportional to 20,911.90, 28,899.90 and 17,129.07 is: 23,672.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.90 : 28,899.90 = 17,129.07 : x
  2. Step 2: Convert to fraction form
    20,911.90/28,899.90 = 17,129.07/x
  3. Step 3: Cross multiply
    20,911.90x = 28,899.90 × 17,129.07
  4. Step 4: Simplify right side
    20,911.90x = 495,028,410.09
  5. Step 5: Solve for x
    x = 495,028,410.09/20,911.90
  6. Step 6: Final answer
    x = 23,672.09

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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.