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Finding the Fourth Proportional to 72,478.64, 100,021.54 and 43,794.32

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Solution

The fourth proportional to 72,478.64, 100,021.54 and 43,794.32 is: 60,436.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,478.64 : 100,021.54 = 43,794.32 : x
  2. Step 2: Convert to fraction form
    72,478.64/100,021.54 = 43,794.32/x
  3. Step 3: Cross multiply
    72,478.64x = 100,021.54 × 43,794.32
  4. Step 4: Simplify right side
    72,478.64x = 4,380,375,329.65
  5. Step 5: Solve for x
    x = 4,380,375,329.65/72,478.64
  6. Step 6: Final answer
    x = 60,436.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.