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Finding the Fourth Proportional to 78,119.84, 117,178.64 and 18,956

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Solution

The fourth proportional to 78,119.84, 117,178.64 and 18,956 is: 28,433.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,119.84 : 117,178.64 = 18,956 : x
  2. Step 2: Convert to fraction form
    78,119.84/117,178.64 = 18,956/x
  3. Step 3: Cross multiply
    78,119.84x = 117,178.64 × 18,956
  4. Step 4: Simplify right side
    78,119.84x = 2,221,238,299.84
  5. Step 5: Solve for x
    x = 2,221,238,299.84/78,119.84
  6. Step 6: Final answer
    x = 28,433.73

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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.