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Finding the Fourth Proportional to 674.44, 1,011.66 and 385.67

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Solution

The fourth proportional to 674.44, 1,011.66 and 385.67 is: 578.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.44 : 1,011.66 = 385.67 : x
  2. Step 2: Convert to fraction form
    674.44/1,011.66 = 385.67/x
  3. Step 3: Cross multiply
    674.44x = 1,011.66 × 385.67
  4. Step 4: Simplify right side
    674.44x = 390,164.98
  5. Step 5: Solve for x
    x = 390,164.98/674.44
  6. Step 6: Final answer
    x = 578.51

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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.