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Finding the Fourth Proportional to 19,199.70, 28,787.18 and 13,259.88

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Solution

The fourth proportional to 19,199.70, 28,787.18 and 13,259.88 is: 19,881.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,199.70 : 28,787.18 = 13,259.88 : x
  2. Step 2: Convert to fraction form
    19,199.70/28,787.18 = 13,259.88/x
  3. Step 3: Cross multiply
    19,199.70x = 28,787.18 × 13,259.88
  4. Step 4: Simplify right side
    19,199.70x = 381,714,486.04
  5. Step 5: Solve for x
    x = 381,714,486.04/19,199.70
  6. Step 6: Final answer
    x = 19,881.27

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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.