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Finding the Fourth Proportional to 674.56, 1,011.90 and 520.60

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Solution

The fourth proportional to 674.56, 1,011.90 and 520.60 is: 780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.56 : 1,011.90 = 520.60 : x
  2. Step 2: Convert to fraction form
    674.56/1,011.90 = 520.60/x
  3. Step 3: Cross multiply
    674.56x = 1,011.90 × 520.60
  4. Step 4: Simplify right side
    674.56x = 526,795.14
  5. Step 5: Solve for x
    x = 526,795.14/674.56
  6. Step 6: Final answer
    x = 780.95

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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.