Home / 20,878.08-28,817.28-12,915.78

Finding the Fourth Proportional to 20,878.08, 28,817.28 and 12,915.78

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Solution

The fourth proportional to 20,878.08, 28,817.28 and 12,915.78 is: 17,827.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.08 : 28,817.28 = 12,915.78 : x
  2. Step 2: Convert to fraction form
    20,878.08/28,817.28 = 12,915.78/x
  3. Step 3: Cross multiply
    20,878.08x = 28,817.28 × 12,915.78
  4. Step 4: Simplify right side
    20,878.08x = 372,197,648.68
  5. Step 5: Solve for x
    x = 372,197,648.68/20,878.08
  6. Step 6: Final answer
    x = 17,827.20

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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.