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Finding the Fourth Proportional to 846.82, 1,271.21 and 639.67

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Solution

The fourth proportional to 846.82, 1,271.21 and 639.67 is: 960.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.82 : 1,271.21 = 639.67 : x
  2. Step 2: Convert to fraction form
    846.82/1,271.21 = 639.67/x
  3. Step 3: Cross multiply
    846.82x = 1,271.21 × 639.67
  4. Step 4: Simplify right side
    846.82x = 813,154.90
  5. Step 5: Solve for x
    x = 813,154.90/846.82
  6. Step 6: Final answer
    x = 960.25

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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.