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Finding the Fourth Proportional to 78,078.62, 117,093.76 and 28,152.30

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Solution

The fourth proportional to 78,078.62, 117,093.76 and 28,152.30 is: 42,219.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,078.62 : 117,093.76 = 28,152.30 : x
  2. Step 2: Convert to fraction form
    78,078.62/117,093.76 = 28,152.30/x
  3. Step 3: Cross multiply
    78,078.62x = 117,093.76 × 28,152.30
  4. Step 4: Simplify right side
    78,078.62x = 3,296,458,659.65
  5. Step 5: Solve for x
    x = 3,296,458,659.65/78,078.62
  6. Step 6: Final answer
    x = 42,219.74

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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.