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Finding the Fourth Proportional to 489.38, 732.62 and 428.63

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Solution

The fourth proportional to 489.38, 732.62 and 428.63 is: 641.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.38 : 732.62 = 428.63 : x
  2. Step 2: Convert to fraction form
    489.38/732.62 = 428.63/x
  3. Step 3: Cross multiply
    489.38x = 732.62 × 428.63
  4. Step 4: Simplify right side
    489.38x = 314,017.10
  5. Step 5: Solve for x
    x = 314,017.10/489.38
  6. Step 6: Final answer
    x = 641.67

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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.