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Finding the Fourth Proportional to 578.78, 798.71 and 316.80

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Solution

The fourth proportional to 578.78, 798.71 and 316.80 is: 437.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.78 : 798.71 = 316.80 : x
  2. Step 2: Convert to fraction form
    578.78/798.71 = 316.80/x
  3. Step 3: Cross multiply
    578.78x = 798.71 × 316.80
  4. Step 4: Simplify right side
    578.78x = 253,028.13
  5. Step 5: Solve for x
    x = 253,028.13/578.78
  6. Step 6: Final answer
    x = 437.18

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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.