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Finding the Fourth Proportional to 20,642.82, 28,489.50 and 12,259.32

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Solution

The fourth proportional to 20,642.82, 28,489.50 and 12,259.32 is: 16,919.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.82 : 28,489.50 = 12,259.32 : x
  2. Step 2: Convert to fraction form
    20,642.82/28,489.50 = 12,259.32/x
  3. Step 3: Cross multiply
    20,642.82x = 28,489.50 × 12,259.32
  4. Step 4: Simplify right side
    20,642.82x = 349,261,897.14
  5. Step 5: Solve for x
    x = 349,261,897.14/20,642.82
  6. Step 6: Final answer
    x = 16,919.29

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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.