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Finding the Fourth Proportional to 425.10, 636.42 and 316.56

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Solution

The fourth proportional to 425.10, 636.42 and 316.56 is: 473.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.10 : 636.42 = 316.56 : x
  2. Step 2: Convert to fraction form
    425.10/636.42 = 316.56/x
  3. Step 3: Cross multiply
    425.10x = 636.42 × 316.56
  4. Step 4: Simplify right side
    425.10x = 201,465.12
  5. Step 5: Solve for x
    x = 201,465.12/425.10
  6. Step 6: Final answer
    x = 473.92

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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.