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Finding the Fourth Proportional to 19,128.88, 28,687.74 and 7,439.32

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Solution

The fourth proportional to 19,128.88, 28,687.74 and 7,439.32 is: 11,156.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,128.88 : 28,687.74 = 7,439.32 : x
  2. Step 2: Convert to fraction form
    19,128.88/28,687.74 = 7,439.32/x
  3. Step 3: Cross multiply
    19,128.88x = 28,687.74 × 7,439.32
  4. Step 4: Simplify right side
    19,128.88x = 213,417,277.94
  5. Step 5: Solve for x
    x = 213,417,277.94/19,128.88
  6. Step 6: Final answer
    x = 11,156.81

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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.