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Finding the Fourth Proportional to 19,361.40, 28,998.90 and 15,905.40

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Solution

The fourth proportional to 19,361.40, 28,998.90 and 15,905.40 is: 23,822.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,361.40 : 28,998.90 = 15,905.40 : x
  2. Step 2: Convert to fraction form
    19,361.40/28,998.90 = 15,905.40/x
  3. Step 3: Cross multiply
    19,361.40x = 28,998.90 × 15,905.40
  4. Step 4: Simplify right side
    19,361.40x = 461,239,104.06
  5. Step 5: Solve for x
    x = 461,239,104.06/19,361.40
  6. Step 6: Final answer
    x = 23,822.61

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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.