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Finding the Fourth Proportional to 12,660.66, 18,990.78 and 4,871.16

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Solution

The fourth proportional to 12,660.66, 18,990.78 and 4,871.16 is: 7,306.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660.66 : 18,990.78 = 4,871.16 : x
  2. Step 2: Convert to fraction form
    12,660.66/18,990.78 = 4,871.16/x
  3. Step 3: Cross multiply
    12,660.66x = 18,990.78 × 4,871.16
  4. Step 4: Simplify right side
    12,660.66x = 92,507,127.90
  5. Step 5: Solve for x
    x = 92,507,127.90/12,660.66
  6. Step 6: Final answer
    x = 7,306.66

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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.