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Finding the Fourth Proportional to 13,520.70, 20,281.05 and 4,286.70

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Solution

The fourth proportional to 13,520.70, 20,281.05 and 4,286.70 is: 6,430.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,520.70 : 20,281.05 = 4,286.70 : x
  2. Step 2: Convert to fraction form
    13,520.70/20,281.05 = 4,286.70/x
  3. Step 3: Cross multiply
    13,520.70x = 20,281.05 × 4,286.70
  4. Step 4: Simplify right side
    13,520.70x = 86,938,777.04
  5. Step 5: Solve for x
    x = 86,938,777.04/13,520.70
  6. Step 6: Final answer
    x = 6,430.05

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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.