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Finding the Fourth Proportional to 8,121.76, 11,209.74 and 5,135.68

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Solution

The fourth proportional to 8,121.76, 11,209.74 and 5,135.68 is: 7,088.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.76 : 11,209.74 = 5,135.68 : x
  2. Step 2: Convert to fraction form
    8,121.76/11,209.74 = 5,135.68/x
  3. Step 3: Cross multiply
    8,121.76x = 11,209.74 × 5,135.68
  4. Step 4: Simplify right side
    8,121.76x = 57,569,637.52
  5. Step 5: Solve for x
    x = 57,569,637.52/8,121.76
  6. Step 6: Final answer
    x = 7,088.32

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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.