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Finding the Fourth Proportional to 19,121.84, 28,644.36 and 8,719.28

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Solution

The fourth proportional to 19,121.84, 28,644.36 and 8,719.28 is: 13,061.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,121.84 : 28,644.36 = 8,719.28 : x
  2. Step 2: Convert to fraction form
    19,121.84/28,644.36 = 8,719.28/x
  3. Step 3: Cross multiply
    19,121.84x = 28,644.36 × 8,719.28
  4. Step 4: Simplify right side
    19,121.84x = 249,758,195.26
  5. Step 5: Solve for x
    x = 249,758,195.26/19,121.84
  6. Step 6: Final answer
    x = 13,061.41

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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.