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Finding the Fourth Proportional to 20,128.70, 28,238.50 and 20,128.70

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Solution

The fourth proportional to 20,128.70, 28,238.50 and 20,128.70 is: 28,238.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.70 : 28,238.50 = 20,128.70 : x
  2. Step 2: Convert to fraction form
    20,128.70/28,238.50 = 20,128.70/x
  3. Step 3: Cross multiply
    20,128.70x = 28,238.50 × 20,128.70
  4. Step 4: Simplify right side
    20,128.70x = 568,404,294.95
  5. Step 5: Solve for x
    x = 568,404,294.95/20,128.70
  6. Step 6: Final answer
    x = 28,238.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.