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Finding the Fourth Proportional to 20,872, 28,803.36 and 12,040

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Solution

The fourth proportional to 20,872, 28,803.36 and 12,040 is: 16,615.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872 : 28,803.36 = 12,040 : x
  2. Step 2: Convert to fraction form
    20,872/28,803.36 = 12,040/x
  3. Step 3: Cross multiply
    20,872x = 28,803.36 × 12,040
  4. Step 4: Simplify right side
    20,872x = 346,792,454.40
  5. Step 5: Solve for x
    x = 346,792,454.40/20,872
  6. Step 6: Final answer
    x = 16,615.20

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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.