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Finding the Fourth Proportional to 19,939.20, 29,908.80 and 18,787.20

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Solution

The fourth proportional to 19,939.20, 29,908.80 and 18,787.20 is: 28,180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,939.20 : 29,908.80 = 18,787.20 : x
  2. Step 2: Convert to fraction form
    19,939.20/29,908.80 = 18,787.20/x
  3. Step 3: Cross multiply
    19,939.20x = 29,908.80 × 18,787.20
  4. Step 4: Simplify right side
    19,939.20x = 561,902,607.36
  5. Step 5: Solve for x
    x = 561,902,607.36/19,939.20
  6. Step 6: Final answer
    x = 28,180.80

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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.