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Finding the Fourth Proportional to 13,321.60, 19,982.40 and 7,079.20

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Solution

The fourth proportional to 13,321.60, 19,982.40 and 7,079.20 is: 10,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.60 : 19,982.40 = 7,079.20 : x
  2. Step 2: Convert to fraction form
    13,321.60/19,982.40 = 7,079.20/x
  3. Step 3: Cross multiply
    13,321.60x = 19,982.40 × 7,079.20
  4. Step 4: Simplify right side
    13,321.60x = 141,459,406.08
  5. Step 5: Solve for x
    x = 141,459,406.08/13,321.60
  6. Step 6: Final answer
    x = 10,618.80

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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.