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Finding the Fourth Proportional to 393,635.51, 543,081.59 and 238,636.78

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Solution

The fourth proportional to 393,635.51, 543,081.59 and 238,636.78 is: 329,236.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,635.51 : 543,081.59 = 238,636.78 : x
  2. Step 2: Convert to fraction form
    393,635.51/543,081.59 = 238,636.78/x
  3. Step 3: Cross multiply
    393,635.51x = 543,081.59 × 238,636.78
  4. Step 4: Simplify right side
    393,635.51x = 129,599,244,152.67
  5. Step 5: Solve for x
    x = 129,599,244,152.67/393,635.51
  6. Step 6: Final answer
    x = 329,236.67

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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.