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Finding the Fourth Proportional to 578.72, 798.64 and 316.76

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Solution

The fourth proportional to 578.72, 798.64 and 316.76 is: 437.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.72 : 798.64 = 316.76 : x
  2. Step 2: Convert to fraction form
    578.72/798.64 = 316.76/x
  3. Step 3: Cross multiply
    578.72x = 798.64 × 316.76
  4. Step 4: Simplify right side
    578.72x = 252,977.21
  5. Step 5: Solve for x
    x = 252,977.21/578.72
  6. Step 6: Final answer
    x = 437.13

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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.