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Finding the Fourth Proportional to 15,203.39, 20,978.57 and 8,487.74

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Solution

The fourth proportional to 15,203.39, 20,978.57 and 8,487.74 is: 11,711.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.39 : 20,978.57 = 8,487.74 : x
  2. Step 2: Convert to fraction form
    15,203.39/20,978.57 = 8,487.74/x
  3. Step 3: Cross multiply
    15,203.39x = 20,978.57 × 8,487.74
  4. Step 4: Simplify right side
    15,203.39x = 178,060,500.40
  5. Step 5: Solve for x
    x = 178,060,500.40/15,203.39
  6. Step 6: Final answer
    x = 11,711.90

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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.