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Finding the Fourth Proportional to 19,874.80, 29,815.80 and 9,989.20

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Solution

The fourth proportional to 19,874.80, 29,815.80 and 9,989.20 is: 14,985.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,874.80 : 29,815.80 = 9,989.20 : x
  2. Step 2: Convert to fraction form
    19,874.80/29,815.80 = 9,989.20/x
  3. Step 3: Cross multiply
    19,874.80x = 29,815.80 × 9,989.20
  4. Step 4: Simplify right side
    19,874.80x = 297,835,989.36
  5. Step 5: Solve for x
    x = 297,835,989.36/19,874.80
  6. Step 6: Final answer
    x = 14,985.61

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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.