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Finding the Fourth Proportional to 13,912.68, 20,868.48 and 5,590.20

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Solution

The fourth proportional to 13,912.68, 20,868.48 and 5,590.20 is: 8,385.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,912.68 : 20,868.48 = 5,590.20 : x
  2. Step 2: Convert to fraction form
    13,912.68/20,868.48 = 5,590.20/x
  3. Step 3: Cross multiply
    13,912.68x = 20,868.48 × 5,590.20
  4. Step 4: Simplify right side
    13,912.68x = 116,658,976.90
  5. Step 5: Solve for x
    x = 116,658,976.90/13,912.68
  6. Step 6: Final answer
    x = 8,385.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.