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Finding the Fourth Proportional to 300,086.20, 450,129.30 and 78,470.20

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Solution

The fourth proportional to 300,086.20, 450,129.30 and 78,470.20 is: 117,705.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    300,086.20 : 450,129.30 = 78,470.20 : x
  2. Step 2: Convert to fraction form
    300,086.20/450,129.30 = 78,470.20/x
  3. Step 3: Cross multiply
    300,086.20x = 450,129.30 × 78,470.20
  4. Step 4: Simplify right side
    300,086.20x = 35,321,736,196.86
  5. Step 5: Solve for x
    x = 35,321,736,196.86/300,086.20
  6. Step 6: Final answer
    x = 117,705.30

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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.