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Finding the Fourth Proportional to 462.96, 639.21 and 315.54

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Solution

The fourth proportional to 462.96, 639.21 and 315.54 is: 435.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.96 : 639.21 = 315.54 : x
  2. Step 2: Convert to fraction form
    462.96/639.21 = 315.54/x
  3. Step 3: Cross multiply
    462.96x = 639.21 × 315.54
  4. Step 4: Simplify right side
    462.96x = 201,696.32
  5. Step 5: Solve for x
    x = 201,696.32/462.96
  6. Step 6: Final answer
    x = 435.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.