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Finding the Fourth Proportional to 842.56, 1,264.40 and 355.60

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Solution

The fourth proportional to 842.56, 1,264.40 and 355.60 is: 533.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.56 : 1,264.40 = 355.60 : x
  2. Step 2: Convert to fraction form
    842.56/1,264.40 = 355.60/x
  3. Step 3: Cross multiply
    842.56x = 1,264.40 × 355.60
  4. Step 4: Simplify right side
    842.56x = 449,620.64
  5. Step 5: Solve for x
    x = 449,620.64/842.56
  6. Step 6: Final answer
    x = 533.64

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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.