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Finding the Fourth Proportional to 78,489.40, 117,631.70 and 36,364.60

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Solution

The fourth proportional to 78,489.40, 117,631.70 and 36,364.60 is: 54,499.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.40 : 117,631.70 = 36,364.60 : x
  2. Step 2: Convert to fraction form
    78,489.40/117,631.70 = 36,364.60/x
  3. Step 3: Cross multiply
    78,489.40x = 117,631.70 × 36,364.60
  4. Step 4: Simplify right side
    78,489.40x = 4,277,629,717.82
  5. Step 5: Solve for x
    x = 4,277,629,717.82/78,489.40
  6. Step 6: Final answer
    x = 54,499.46

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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.