Home / 20,684.19-28,550.20-13,515.16

Finding the Fourth Proportional to 20,684.19, 28,550.20 and 13,515.16

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Solution

The fourth proportional to 20,684.19, 28,550.20 and 13,515.16 is: 18,654.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,684.19 : 28,550.20 = 13,515.16 : x
  2. Step 2: Convert to fraction form
    20,684.19/28,550.20 = 13,515.16/x
  3. Step 3: Cross multiply
    20,684.19x = 28,550.20 × 13,515.16
  4. Step 4: Simplify right side
    20,684.19x = 385,860,494.74
  5. Step 5: Solve for x
    x = 385,860,494.74/20,684.19
  6. Step 6: Final answer
    x = 18,654.85

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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.