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Finding the Fourth Proportional to 19,321.23, 28,965.07 and 8,639.47

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Solution

The fourth proportional to 19,321.23, 28,965.07 and 8,639.47 is: 12,951.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.23 : 28,965.07 = 8,639.47 : x
  2. Step 2: Convert to fraction form
    19,321.23/28,965.07 = 8,639.47/x
  3. Step 3: Cross multiply
    19,321.23x = 28,965.07 × 8,639.47
  4. Step 4: Simplify right side
    19,321.23x = 250,242,853.31
  5. Step 5: Solve for x
    x = 250,242,853.31/19,321.23
  6. Step 6: Final answer
    x = 12,951.70

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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.