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Finding the Fourth Proportional to 15,188.59, 20,959.76 and 8,289.49

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Solution

The fourth proportional to 15,188.59, 20,959.76 and 8,289.49 is: 11,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,188.59 : 20,959.76 = 8,289.49 : x
  2. Step 2: Convert to fraction form
    15,188.59/20,959.76 = 8,289.49/x
  3. Step 3: Cross multiply
    15,188.59x = 20,959.76 × 8,289.49
  4. Step 4: Simplify right side
    15,188.59x = 173,745,728.55
  5. Step 5: Solve for x
    x = 173,745,728.55/15,188.59
  6. Step 6: Final answer
    x = 11,439.23

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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.