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Finding the Fourth Proportional to 78,400.60, 117,600.90 and 36,928.60

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Solution

The fourth proportional to 78,400.60, 117,600.90 and 36,928.60 is: 55,392.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,400.60 : 117,600.90 = 36,928.60 : x
  2. Step 2: Convert to fraction form
    78,400.60/117,600.90 = 36,928.60/x
  3. Step 3: Cross multiply
    78,400.60x = 117,600.90 × 36,928.60
  4. Step 4: Simplify right side
    78,400.60x = 4,342,836,595.74
  5. Step 5: Solve for x
    x = 4,342,836,595.74/78,400.60
  6. Step 6: Final answer
    x = 55,392.90

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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.