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Finding the Fourth Proportional to 817.64, 1,225.36 and 426.84

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Solution

The fourth proportional to 817.64, 1,225.36 and 426.84 is: 639.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.64 : 1,225.36 = 426.84 : x
  2. Step 2: Convert to fraction form
    817.64/1,225.36 = 426.84/x
  3. Step 3: Cross multiply
    817.64x = 1,225.36 × 426.84
  4. Step 4: Simplify right side
    817.64x = 523,028.60
  5. Step 5: Solve for x
    x = 523,028.60/817.64
  6. Step 6: Final answer
    x = 639.68

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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.