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Finding the Fourth Proportional to 12,620.81, 18,931.22 and 3,386.81

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Solution

The fourth proportional to 12,620.81, 18,931.22 and 3,386.81 is: 5,080.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.81 : 18,931.22 = 3,386.81 : x
  2. Step 2: Convert to fraction form
    12,620.81/18,931.22 = 3,386.81/x
  3. Step 3: Cross multiply
    12,620.81x = 18,931.22 × 3,386.81
  4. Step 4: Simplify right side
    12,620.81x = 64,116,488.30
  5. Step 5: Solve for x
    x = 64,116,488.30/12,620.81
  6. Step 6: Final answer
    x = 5,080.22

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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.