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Finding the Fourth Proportional to 19,639.48, 29,484.18 and 11,863.48

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Solution

The fourth proportional to 19,639.48, 29,484.18 and 11,863.48 is: 17,810.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,639.48 : 29,484.18 = 11,863.48 : x
  2. Step 2: Convert to fraction form
    19,639.48/29,484.18 = 11,863.48/x
  3. Step 3: Cross multiply
    19,639.48x = 29,484.18 × 11,863.48
  4. Step 4: Simplify right side
    19,639.48x = 349,784,979.75
  5. Step 5: Solve for x
    x = 349,784,979.75/19,639.48
  6. Step 6: Final answer
    x = 17,810.30

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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.