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Finding the Fourth Proportional to 20,603, 28,432.14 and 11,171.56

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Solution

The fourth proportional to 20,603, 28,432.14 and 11,171.56 is: 15,416.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603 : 28,432.14 = 11,171.56 : x
  2. Step 2: Convert to fraction form
    20,603/28,432.14 = 11,171.56/x
  3. Step 3: Cross multiply
    20,603x = 28,432.14 × 11,171.56
  4. Step 4: Simplify right side
    20,603x = 317,631,357.94
  5. Step 5: Solve for x
    x = 317,631,357.94/20,603
  6. Step 6: Final answer
    x = 15,416.75

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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.