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Finding the Fourth Proportional to 578.49, 798.31 and 316.51

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Solution

The fourth proportional to 578.49, 798.31 and 316.51 is: 436.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.49 : 798.31 = 316.51 : x
  2. Step 2: Convert to fraction form
    578.49/798.31 = 316.51/x
  3. Step 3: Cross multiply
    578.49x = 798.31 × 316.51
  4. Step 4: Simplify right side
    578.49x = 252,671.50
  5. Step 5: Solve for x
    x = 252,671.50/578.49
  6. Step 6: Final answer
    x = 436.78

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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.