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Finding the Fourth Proportional to 78,993.39, 118,538.70 and 71,611.05

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Solution

The fourth proportional to 78,993.39, 118,538.70 and 71,611.05 is: 107,460.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,993.39 : 118,538.70 = 71,611.05 : x
  2. Step 2: Convert to fraction form
    78,993.39/118,538.70 = 71,611.05/x
  3. Step 3: Cross multiply
    78,993.39x = 118,538.70 × 71,611.05
  4. Step 4: Simplify right side
    78,993.39x = 8,488,680,772.64
  5. Step 5: Solve for x
    x = 8,488,680,772.64/78,993.39
  6. Step 6: Final answer
    x = 107,460.65

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1.5x scale

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.