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Finding the Fourth Proportional to 8,615.28, 12,934.44 and 5,111.76

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Solution

The fourth proportional to 8,615.28, 12,934.44 and 5,111.76 is: 7,674.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.28 : 12,934.44 = 5,111.76 : x
  2. Step 2: Convert to fraction form
    8,615.28/12,934.44 = 5,111.76/x
  3. Step 3: Cross multiply
    8,615.28x = 12,934.44 × 5,111.76
  4. Step 4: Simplify right side
    8,615.28x = 66,117,753.01
  5. Step 5: Solve for x
    x = 66,117,753.01/8,615.28
  6. Step 6: Final answer
    x = 7,674.48

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1.5x scale

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.