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Finding the Fourth Proportional to 386,842.60, 579,956.70 and 211,738.60

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Solution

The fourth proportional to 386,842.60, 579,956.70 and 211,738.60 is: 317,439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,842.60 : 579,956.70 = 211,738.60 : x
  2. Step 2: Convert to fraction form
    386,842.60/579,956.70 = 211,738.60/x
  3. Step 3: Cross multiply
    386,842.60x = 579,956.70 × 211,738.60
  4. Step 4: Simplify right side
    386,842.60x = 122,799,219,718.62
  5. Step 5: Solve for x
    x = 122,799,219,718.62/386,842.60
  6. Step 6: Final answer
    x = 317,439.75

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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.