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Finding the Fourth Proportional to 521.68, 779.60 and 425.60

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Solution

The fourth proportional to 521.68, 779.60 and 425.60 is: 636.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.68 : 779.60 = 425.60 : x
  2. Step 2: Convert to fraction form
    521.68/779.60 = 425.60/x
  3. Step 3: Cross multiply
    521.68x = 779.60 × 425.60
  4. Step 4: Simplify right side
    521.68x = 331,797.76
  5. Step 5: Solve for x
    x = 331,797.76/521.68
  6. Step 6: Final answer
    x = 636.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.