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Finding the Fourth Proportional to 28,381.40, 42,571.98 and 8,659.90

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Solution

The fourth proportional to 28,381.40, 42,571.98 and 8,659.90 is: 12,989.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.40 : 42,571.98 = 8,659.90 : x
  2. Step 2: Convert to fraction form
    28,381.40/42,571.98 = 8,659.90/x
  3. Step 3: Cross multiply
    28,381.40x = 42,571.98 × 8,659.90
  4. Step 4: Simplify right side
    28,381.40x = 368,669,089.60
  5. Step 5: Solve for x
    x = 368,669,089.60/28,381.40
  6. Step 6: Final answer
    x = 12,989.81

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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.