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Finding the Fourth Proportional to 387,620.56, 534,889.74 and 217,880.20

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Solution

The fourth proportional to 387,620.56, 534,889.74 and 217,880.20 is: 300,659.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,620.56 : 534,889.74 = 217,880.20 : x
  2. Step 2: Convert to fraction form
    387,620.56/534,889.74 = 217,880.20/x
  3. Step 3: Cross multiply
    387,620.56x = 534,889.74 × 217,880.20
  4. Step 4: Simplify right side
    387,620.56x = 116,541,883,529.15
  5. Step 5: Solve for x
    x = 116,541,883,529.15/387,620.56
  6. Step 6: Final answer
    x = 300,659.71

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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.