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Finding the Fourth Proportional to 15,199.35, 20,978.60 and 8,913.75

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Solution

The fourth proportional to 15,199.35, 20,978.60 and 8,913.75 is: 12,303.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,199.35 : 20,978.60 = 8,913.75 : x
  2. Step 2: Convert to fraction form
    15,199.35/20,978.60 = 8,913.75/x
  3. Step 3: Cross multiply
    15,199.35x = 20,978.60 × 8,913.75
  4. Step 4: Simplify right side
    15,199.35x = 186,997,995.75
  5. Step 5: Solve for x
    x = 186,997,995.75/15,199.35
  6. Step 6: Final answer
    x = 12,303.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.