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Finding the Fourth Proportional to 578.78, 798.71 and 316.79

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Solution

The fourth proportional to 578.78, 798.71 and 316.79 is: 437.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.78 : 798.71 = 316.79 : x
  2. Step 2: Convert to fraction form
    578.78/798.71 = 316.79/x
  3. Step 3: Cross multiply
    578.78x = 798.71 × 316.79
  4. Step 4: Simplify right side
    578.78x = 253,021.76
  5. Step 5: Solve for x
    x = 253,021.76/578.78
  6. Step 6: Final answer
    x = 437.16

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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.