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Finding the Fourth Proportional to 425.04, 638.79 and 281.67

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Solution

The fourth proportional to 425.04, 638.79 and 281.67 is: 423.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.04 : 638.79 = 281.67 : x
  2. Step 2: Convert to fraction form
    425.04/638.79 = 281.67/x
  3. Step 3: Cross multiply
    425.04x = 638.79 × 281.67
  4. Step 4: Simplify right side
    425.04x = 179,927.98
  5. Step 5: Solve for x
    x = 179,927.98/425.04
  6. Step 6: Final answer
    x = 423.32

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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.