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Finding the Fourth Proportional to 14,105.20, 21,157.80 and 5,340.40

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Solution

The fourth proportional to 14,105.20, 21,157.80 and 5,340.40 is: 8,010.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,105.20 : 21,157.80 = 5,340.40 : x
  2. Step 2: Convert to fraction form
    14,105.20/21,157.80 = 5,340.40/x
  3. Step 3: Cross multiply
    14,105.20x = 21,157.80 × 5,340.40
  4. Step 4: Simplify right side
    14,105.20x = 112,991,115.12
  5. Step 5: Solve for x
    x = 112,991,115.12/14,105.20
  6. Step 6: Final answer
    x = 8,010.60

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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.