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Finding the Fourth Proportional to 715.46, 986.90 and 450.05

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Solution

The fourth proportional to 715.46, 986.90 and 450.05 is: 620.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.46 : 986.90 = 450.05 : x
  2. Step 2: Convert to fraction form
    715.46/986.90 = 450.05/x
  3. Step 3: Cross multiply
    715.46x = 986.90 × 450.05
  4. Step 4: Simplify right side
    715.46x = 444,147.16
  5. Step 5: Solve for x
    x = 444,147.16/715.46
  6. Step 6: Final answer
    x = 620.79

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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.