Home / 20,909.90-28,815.78-20,525.55

Finding the Fourth Proportional to 20,909.90, 28,815.78 and 20,525.55

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Solution

The fourth proportional to 20,909.90, 28,815.78 and 20,525.55 is: 28,286.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.90 : 28,815.78 = 20,525.55 : x
  2. Step 2: Convert to fraction form
    20,909.90/28,815.78 = 20,525.55/x
  3. Step 3: Cross multiply
    20,909.90x = 28,815.78 × 20,525.55
  4. Step 4: Simplify right side
    20,909.90x = 591,459,864.18
  5. Step 5: Solve for x
    x = 591,459,864.18/20,909.90
  6. Step 6: Final answer
    x = 28,286.12

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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.