Home / 20,817.42-28,728.72-11,385.98

Finding the Fourth Proportional to 20,817.42, 28,728.72 and 11,385.98

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Solution

The fourth proportional to 20,817.42, 28,728.72 and 11,385.98 is: 15,713.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.42 : 28,728.72 = 11,385.98 : x
  2. Step 2: Convert to fraction form
    20,817.42/28,728.72 = 11,385.98/x
  3. Step 3: Cross multiply
    20,817.42x = 28,728.72 × 11,385.98
  4. Step 4: Simplify right side
    20,817.42x = 327,104,631.35
  5. Step 5: Solve for x
    x = 327,104,631.35/20,817.42
  6. Step 6: Final answer
    x = 15,713.02

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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.