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Finding the Fourth Proportional to 20,737.90, 31,079.04 and 19,409.29

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Solution

The fourth proportional to 20,737.90, 31,079.04 and 19,409.29 is: 29,087.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,737.90 : 31,079.04 = 19,409.29 : x
  2. Step 2: Convert to fraction form
    20,737.90/31,079.04 = 19,409.29/x
  3. Step 3: Cross multiply
    20,737.90x = 31,079.04 × 19,409.29
  4. Step 4: Simplify right side
    20,737.90x = 603,222,100.28
  5. Step 5: Solve for x
    x = 603,222,100.28/20,737.90
  6. Step 6: Final answer
    x = 29,087.91

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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.