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Finding the Fourth Proportional to 19,689.47, 29,500.79 and 11,881.88

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Solution

The fourth proportional to 19,689.47, 29,500.79 and 11,881.88 is: 17,802.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,689.47 : 29,500.79 = 11,881.88 : x
  2. Step 2: Convert to fraction form
    19,689.47/29,500.79 = 11,881.88/x
  3. Step 3: Cross multiply
    19,689.47x = 29,500.79 × 11,881.88
  4. Step 4: Simplify right side
    19,689.47x = 350,524,639.77
  5. Step 5: Solve for x
    x = 350,524,639.77/19,689.47
  6. Step 6: Final answer
    x = 17,802.65

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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.