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Finding the Fourth Proportional to 825.36, 1,238.88 and 644.76

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Solution

The fourth proportional to 825.36, 1,238.88 and 644.76 is: 967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.36 : 1,238.88 = 644.76 : x
  2. Step 2: Convert to fraction form
    825.36/1,238.88 = 644.76/x
  3. Step 3: Cross multiply
    825.36x = 1,238.88 × 644.76
  4. Step 4: Simplify right side
    825.36x = 798,780.27
  5. Step 5: Solve for x
    x = 798,780.27/825.36
  6. Step 6: Final answer
    x = 967.80

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1.5x scale

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.