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Finding the Fourth Proportional to 20,398.86, 28,150.86 and 11,447.01

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Solution

The fourth proportional to 20,398.86, 28,150.86 and 11,447.01 is: 15,797.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.86 : 28,150.86 = 11,447.01 : x
  2. Step 2: Convert to fraction form
    20,398.86/28,150.86 = 11,447.01/x
  3. Step 3: Cross multiply
    20,398.86x = 28,150.86 × 11,447.01
  4. Step 4: Simplify right side
    20,398.86x = 322,243,175.93
  5. Step 5: Solve for x
    x = 322,243,175.93/20,398.86
  6. Step 6: Final answer
    x = 15,797.12

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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.