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Finding the Fourth Proportional to 18,976.80, 28,471.68 and 17,136.48

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Solution

The fourth proportional to 18,976.80, 28,471.68 and 17,136.48 is: 25,710.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,976.80 : 28,471.68 = 17,136.48 : x
  2. Step 2: Convert to fraction form
    18,976.80/28,471.68 = 17,136.48/x
  3. Step 3: Cross multiply
    18,976.80x = 28,471.68 × 17,136.48
  4. Step 4: Simplify right side
    18,976.80x = 487,904,374.89
  5. Step 5: Solve for x
    x = 487,904,374.89/18,976.80
  6. Step 6: Final answer
    x = 25,710.57

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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.