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Finding the Fourth Proportional to 68,679.81, 103,003.54 and 18,748.03

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Solution

The fourth proportional to 68,679.81, 103,003.54 and 18,748.03 is: 28,117.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,679.81 : 103,003.54 = 18,748.03 : x
  2. Step 2: Convert to fraction form
    68,679.81/103,003.54 = 18,748.03/x
  3. Step 3: Cross multiply
    68,679.81x = 103,003.54 × 18,748.03
  4. Step 4: Simplify right side
    68,679.81x = 1,931,113,458.03
  5. Step 5: Solve for x
    x = 1,931,113,458.03/68,679.81
  6. Step 6: Final answer
    x = 28,117.63

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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.