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Finding the Fourth Proportional to 15,201.68, 20,978.73 and 8,487.05

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Solution

The fourth proportional to 15,201.68, 20,978.73 and 8,487.05 is: 11,712.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,201.68 : 20,978.73 = 8,487.05 : x
  2. Step 2: Convert to fraction form
    15,201.68/20,978.73 = 8,487.05/x
  3. Step 3: Cross multiply
    15,201.68x = 20,978.73 × 8,487.05
  4. Step 4: Simplify right side
    15,201.68x = 178,047,425.55
  5. Step 5: Solve for x
    x = 178,047,425.55/15,201.68
  6. Step 6: Final answer
    x = 11,712.36

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1.5x scale

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.