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Finding the Fourth Proportional to 425.55, 636.87 and 357.15

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Solution

The fourth proportional to 425.55, 636.87 and 357.15 is: 534.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.55 : 636.87 = 357.15 : x
  2. Step 2: Convert to fraction form
    425.55/636.87 = 357.15/x
  3. Step 3: Cross multiply
    425.55x = 636.87 × 357.15
  4. Step 4: Simplify right side
    425.55x = 227,458.12
  5. Step 5: Solve for x
    x = 227,458.12/425.55
  6. Step 6: Final answer
    x = 534.50

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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.