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Finding the Fourth Proportional to 12,139.76, 18,210.62 and 3,374.68

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Solution

The fourth proportional to 12,139.76, 18,210.62 and 3,374.68 is: 5,062.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.76 : 18,210.62 = 3,374.68 : x
  2. Step 2: Convert to fraction form
    12,139.76/18,210.62 = 3,374.68/x
  3. Step 3: Cross multiply
    12,139.76x = 18,210.62 × 3,374.68
  4. Step 4: Simplify right side
    12,139.76x = 61,455,015.10
  5. Step 5: Solve for x
    x = 61,455,015.10/12,139.76
  6. Step 6: Final answer
    x = 5,062.29

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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.