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Finding the Fourth Proportional to 28,471.20, 42,706.80 and 18,128.80

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Solution

The fourth proportional to 28,471.20, 42,706.80 and 18,128.80 is: 27,193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,471.20 : 42,706.80 = 18,128.80 : x
  2. Step 2: Convert to fraction form
    28,471.20/42,706.80 = 18,128.80/x
  3. Step 3: Cross multiply
    28,471.20x = 42,706.80 × 18,128.80
  4. Step 4: Simplify right side
    28,471.20x = 774,223,035.84
  5. Step 5: Solve for x
    x = 774,223,035.84/28,471.20
  6. Step 6: Final answer
    x = 27,193.20

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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.