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Finding the Fourth Proportional to 20,691, 28,553.58 and 11,259.63

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Solution

The fourth proportional to 20,691, 28,553.58 and 11,259.63 is: 15,538.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691 : 28,553.58 = 11,259.63 : x
  2. Step 2: Convert to fraction form
    20,691/28,553.58 = 11,259.63/x
  3. Step 3: Cross multiply
    20,691x = 28,553.58 × 11,259.63
  4. Step 4: Simplify right side
    20,691x = 321,502,745.98
  5. Step 5: Solve for x
    x = 321,502,745.98/20,691
  6. Step 6: Final answer
    x = 15,538.29

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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.