Home / 20,909.52-28,855.88-11,478.80

Finding the Fourth Proportional to 20,909.52, 28,855.88 and 11,478.80

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Solution

The fourth proportional to 20,909.52, 28,855.88 and 11,478.80 is: 15,841.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.52 : 28,855.88 = 11,478.80 : x
  2. Step 2: Convert to fraction form
    20,909.52/28,855.88 = 11,478.80/x
  3. Step 3: Cross multiply
    20,909.52x = 28,855.88 × 11,478.80
  4. Step 4: Simplify right side
    20,909.52x = 331,230,875.34
  5. Step 5: Solve for x
    x = 331,230,875.34/20,909.52
  6. Step 6: Final answer
    x = 15,841.15

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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.