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Finding the Fourth Proportional to 28,381.17, 42,571.76 and 8,659.83

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Solution

The fourth proportional to 28,381.17, 42,571.76 and 8,659.83 is: 12,989.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.17 : 42,571.76 = 8,659.83 : x
  2. Step 2: Convert to fraction form
    28,381.17/42,571.76 = 8,659.83/x
  3. Step 3: Cross multiply
    28,381.17x = 42,571.76 × 8,659.83
  4. Step 4: Simplify right side
    28,381.17x = 368,664,161.10
  5. Step 5: Solve for x
    x = 368,664,161.10/28,381.17
  6. Step 6: Final answer
    x = 12,989.75

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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.