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Finding the Fourth Proportional to 675.24, 1,012.78 and 309.93

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Solution

The fourth proportional to 675.24, 1,012.78 and 309.93 is: 464.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.24 : 1,012.78 = 309.93 : x
  2. Step 2: Convert to fraction form
    675.24/1,012.78 = 309.93/x
  3. Step 3: Cross multiply
    675.24x = 1,012.78 × 309.93
  4. Step 4: Simplify right side
    675.24x = 313,890.91
  5. Step 5: Solve for x
    x = 313,890.91/675.24
  6. Step 6: Final answer
    x = 464.86

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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.