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Finding the Fourth Proportional to 386,513.92, 579,478.56 and 253,427.68

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Solution

The fourth proportional to 386,513.92, 579,478.56 and 253,427.68 is: 379,949.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,513.92 : 579,478.56 = 253,427.68 : x
  2. Step 2: Convert to fraction form
    386,513.92/579,478.56 = 253,427.68/x
  3. Step 3: Cross multiply
    386,513.92x = 579,478.56 × 253,427.68
  4. Step 4: Simplify right side
    386,513.92x = 146,855,907,070.54
  5. Step 5: Solve for x
    x = 146,855,907,070.54/386,513.92
  6. Step 6: Final answer
    x = 379,949.85

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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.