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Finding the Fourth Proportional to 646.67, 970.46 and 281.56

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Solution

The fourth proportional to 646.67, 970.46 and 281.56 is: 422.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.67 : 970.46 = 281.56 : x
  2. Step 2: Convert to fraction form
    646.67/970.46 = 281.56/x
  3. Step 3: Cross multiply
    646.67x = 970.46 × 281.56
  4. Step 4: Simplify right side
    646.67x = 273,242.72
  5. Step 5: Solve for x
    x = 273,242.72/646.67
  6. Step 6: Final answer
    x = 422.54

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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.