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Finding the Fourth Proportional to 139,520.40, 209,280.60 and 73,984.40

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Solution

The fourth proportional to 139,520.40, 209,280.60 and 73,984.40 is: 110,976.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,520.40 : 209,280.60 = 73,984.40 : x
  2. Step 2: Convert to fraction form
    139,520.40/209,280.60 = 73,984.40/x
  3. Step 3: Cross multiply
    139,520.40x = 209,280.60 × 73,984.40
  4. Step 4: Simplify right side
    139,520.40x = 15,483,499,622.64
  5. Step 5: Solve for x
    x = 15,483,499,622.64/139,520.40
  6. Step 6: Final answer
    x = 110,976.60

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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.