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Finding the Fourth Proportional to 825.84, 1,238.16 and 392.64

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Solution

The fourth proportional to 825.84, 1,238.16 and 392.64 is: 588.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.84 : 1,238.16 = 392.64 : x
  2. Step 2: Convert to fraction form
    825.84/1,238.16 = 392.64/x
  3. Step 3: Cross multiply
    825.84x = 1,238.16 × 392.64
  4. Step 4: Simplify right side
    825.84x = 486,151.14
  5. Step 5: Solve for x
    x = 486,151.14/825.84
  6. Step 6: Final answer
    x = 588.67

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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.