Home / 20,801.28-28,720.80-12,854.40

Finding the Fourth Proportional to 20,801.28, 28,720.80 and 12,854.40

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Solution

The fourth proportional to 20,801.28, 28,720.80 and 12,854.40 is: 17,748.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.28 : 28,720.80 = 12,854.40 : x
  2. Step 2: Convert to fraction form
    20,801.28/28,720.80 = 12,854.40/x
  3. Step 3: Cross multiply
    20,801.28x = 28,720.80 × 12,854.40
  4. Step 4: Simplify right side
    20,801.28x = 369,188,651.52
  5. Step 5: Solve for x
    x = 369,188,651.52/20,801.28
  6. Step 6: Final answer
    x = 17,748.36

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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.