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Finding the Fourth Proportional to 642,788, 886,954.32 and 356,308

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Solution

The fourth proportional to 642,788, 886,954.32 and 356,308 is: 491,653.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,788 : 886,954.32 = 356,308 : x
  2. Step 2: Convert to fraction form
    642,788/886,954.32 = 356,308/x
  3. Step 3: Cross multiply
    642,788x = 886,954.32 × 356,308
  4. Step 4: Simplify right side
    642,788x = 316,028,919,850.56
  5. Step 5: Solve for x
    x = 316,028,919,850.56/642,788
  6. Step 6: Final answer
    x = 491,653.42

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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.