Home / 20,871.08-28,805.04-12,915.86

Finding the Fourth Proportional to 20,871.08, 28,805.04 and 12,915.86

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Solution

The fourth proportional to 20,871.08, 28,805.04 and 12,915.86 is: 17,825.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.08 : 28,805.04 = 12,915.86 : x
  2. Step 2: Convert to fraction form
    20,871.08/28,805.04 = 12,915.86/x
  3. Step 3: Cross multiply
    20,871.08x = 28,805.04 × 12,915.86
  4. Step 4: Simplify right side
    20,871.08x = 372,041,799.36
  5. Step 5: Solve for x
    x = 372,041,799.36/20,871.08
  6. Step 6: Final answer
    x = 17,825.71

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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.