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Finding the Fourth Proportional to 111,763.60, 167,645.19 and 78,631.76

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Solution

The fourth proportional to 111,763.60, 167,645.19 and 78,631.76 is: 117,947.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,763.60 : 167,645.19 = 78,631.76 : x
  2. Step 2: Convert to fraction form
    111,763.60/167,645.19 = 78,631.76/x
  3. Step 3: Cross multiply
    111,763.60x = 167,645.19 × 78,631.76
  4. Step 4: Simplify right side
    111,763.60x = 13,182,237,059.22
  5. Step 5: Solve for x
    x = 13,182,237,059.22/111,763.60
  6. Step 6: Final answer
    x = 117,947.50

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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.