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Finding the Fourth Proportional to 825.79, 1,238.69 and 642.67

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Solution

The fourth proportional to 825.79, 1,238.69 and 642.67 is: 964.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.79 : 1,238.69 = 642.67 : x
  2. Step 2: Convert to fraction form
    825.79/1,238.69 = 642.67/x
  3. Step 3: Cross multiply
    825.79x = 1,238.69 × 642.67
  4. Step 4: Simplify right side
    825.79x = 796,068.90
  5. Step 5: Solve for x
    x = 796,068.90/825.79
  6. Step 6: Final answer
    x = 964.01

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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.