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Finding the Fourth Proportional to 19,871.80, 29,811.30 and 9,986.20

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Solution

The fourth proportional to 19,871.80, 29,811.30 and 9,986.20 is: 14,981.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,871.80 : 29,811.30 = 9,986.20 : x
  2. Step 2: Convert to fraction form
    19,871.80/29,811.30 = 9,986.20/x
  3. Step 3: Cross multiply
    19,871.80x = 29,811.30 × 9,986.20
  4. Step 4: Simplify right side
    19,871.80x = 297,701,604.06
  5. Step 5: Solve for x
    x = 297,701,604.06/19,871.80
  6. Step 6: Final answer
    x = 14,981.11

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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.