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Finding the Fourth Proportional to 19,388.71, 29,088.07 and 8,138.01

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Solution

The fourth proportional to 19,388.71, 29,088.07 and 8,138.01 is: 12,209.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,388.71 : 29,088.07 = 8,138.01 : x
  2. Step 2: Convert to fraction form
    19,388.71/29,088.07 = 8,138.01/x
  3. Step 3: Cross multiply
    19,388.71x = 29,088.07 × 8,138.01
  4. Step 4: Simplify right side
    19,388.71x = 236,718,984.20
  5. Step 5: Solve for x
    x = 236,718,984.20/19,388.71
  6. Step 6: Final answer
    x = 12,209.12

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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.