Home / 20,680.40-28,563-13,638.80

Finding the Fourth Proportional to 20,680.40, 28,563 and 13,638.80

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Solution

The fourth proportional to 20,680.40, 28,563 and 13,638.80 is: 18,837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.40 : 28,563 = 13,638.80 : x
  2. Step 2: Convert to fraction form
    20,680.40/28,563 = 13,638.80/x
  3. Step 3: Cross multiply
    20,680.40x = 28,563 × 13,638.80
  4. Step 4: Simplify right side
    20,680.40x = 389,565,044.40
  5. Step 5: Solve for x
    x = 389,565,044.40/20,680.40
  6. Step 6: Final answer
    x = 18,837.40

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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.