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Finding the Fourth Proportional to 13,620.60, 20,430.90 and 4,865.40

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Solution

The fourth proportional to 13,620.60, 20,430.90 and 4,865.40 is: 7,298.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.60 : 20,430.90 = 4,865.40 : x
  2. Step 2: Convert to fraction form
    13,620.60/20,430.90 = 4,865.40/x
  3. Step 3: Cross multiply
    13,620.60x = 20,430.90 × 4,865.40
  4. Step 4: Simplify right side
    13,620.60x = 99,404,500.86
  5. Step 5: Solve for x
    x = 99,404,500.86/13,620.60
  6. Step 6: Final answer
    x = 7,298.10

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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.