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Finding the Fourth Proportional to 20,560.32, 28,368 and 13,104

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Solution

The fourth proportional to 20,560.32, 28,368 and 13,104 is: 18,080.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,560.32 : 28,368 = 13,104 : x
  2. Step 2: Convert to fraction form
    20,560.32/28,368 = 13,104/x
  3. Step 3: Cross multiply
    20,560.32x = 28,368 × 13,104
  4. Step 4: Simplify right side
    20,560.32x = 371,734,272
  5. Step 5: Solve for x
    x = 371,734,272/20,560.32
  6. Step 6: Final answer
    x = 18,080.18

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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.