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Finding the Fourth Proportional to 139,238.80, 208,858.20 and 45,747.60

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Solution

The fourth proportional to 139,238.80, 208,858.20 and 45,747.60 is: 68,621.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,238.80 : 208,858.20 = 45,747.60 : x
  2. Step 2: Convert to fraction form
    139,238.80/208,858.20 = 45,747.60/x
  3. Step 3: Cross multiply
    139,238.80x = 208,858.20 × 45,747.60
  4. Step 4: Simplify right side
    139,238.80x = 9,554,761,390.32
  5. Step 5: Solve for x
    x = 9,554,761,390.32/139,238.80
  6. Step 6: Final answer
    x = 68,621.40

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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.