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Finding the Fourth Proportional to 139,219.20, 208,893.60 and 72,734.40

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Solution

The fourth proportional to 139,219.20, 208,893.60 and 72,734.40 is: 109,135.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,219.20 : 208,893.60 = 72,734.40 : x
  2. Step 2: Convert to fraction form
    139,219.20/208,893.60 = 72,734.40/x
  3. Step 3: Cross multiply
    139,219.20x = 208,893.60 × 72,734.40
  4. Step 4: Simplify right side
    139,219.20x = 15,193,750,659.84
  5. Step 5: Solve for x
    x = 15,193,750,659.84/139,219.20
  6. Step 6: Final answer
    x = 109,135.45

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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.