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Finding the Fourth Proportional to 312,469.20, 468,728.09 and 102,128.40

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Solution

The fourth proportional to 312,469.20, 468,728.09 and 102,128.40 is: 153,200.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,469.20 : 468,728.09 = 102,128.40 : x
  2. Step 2: Convert to fraction form
    312,469.20/468,728.09 = 102,128.40/x
  3. Step 3: Cross multiply
    312,469.20x = 468,728.09 × 102,128.40
  4. Step 4: Simplify right side
    312,469.20x = 47,870,449,356.11
  5. Step 5: Solve for x
    x = 47,870,449,356.11/312,469.20
  6. Step 6: Final answer
    x = 153,200.54

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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.