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Finding the Fourth Proportional to 784.31, 1,176.62 and 264.38

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Solution

The fourth proportional to 784.31, 1,176.62 and 264.38 is: 396.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.31 : 1,176.62 = 264.38 : x
  2. Step 2: Convert to fraction form
    784.31/1,176.62 = 264.38/x
  3. Step 3: Cross multiply
    784.31x = 1,176.62 × 264.38
  4. Step 4: Simplify right side
    784.31x = 311,067.59
  5. Step 5: Solve for x
    x = 311,067.59/784.31
  6. Step 6: Final answer
    x = 396.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.