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Finding the Fourth Proportional to 13,320.60, 19,978.96 and 8,375.08

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Solution

The fourth proportional to 13,320.60, 19,978.96 and 8,375.08 is: 12,561.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,320.60 : 19,978.96 = 8,375.08 : x
  2. Step 2: Convert to fraction form
    13,320.60/19,978.96 = 8,375.08/x
  3. Step 3: Cross multiply
    13,320.60x = 19,978.96 × 8,375.08
  4. Step 4: Simplify right side
    13,320.60x = 167,325,388.32
  5. Step 5: Solve for x
    x = 167,325,388.32/13,320.60
  6. Step 6: Final answer
    x = 12,561.40

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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.