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Finding the Fourth Proportional to 19,239, 28,859.64 and 5,389.08

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Solution

The fourth proportional to 19,239, 28,859.64 and 5,389.08 is: 8,083.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,239 : 28,859.64 = 5,389.08 : x
  2. Step 2: Convert to fraction form
    19,239/28,859.64 = 5,389.08/x
  3. Step 3: Cross multiply
    19,239x = 28,859.64 × 5,389.08
  4. Step 4: Simplify right side
    19,239x = 155,526,908.73
  5. Step 5: Solve for x
    x = 155,526,908.73/19,239
  6. Step 6: Final answer
    x = 8,083.94

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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.