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Finding the Fourth Proportional to 468.21, 646.16 and 281.70

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Solution

The fourth proportional to 468.21, 646.16 and 281.70 is: 388.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.21 : 646.16 = 281.70 : x
  2. Step 2: Convert to fraction form
    468.21/646.16 = 281.70/x
  3. Step 3: Cross multiply
    468.21x = 646.16 × 281.70
  4. Step 4: Simplify right side
    468.21x = 182,023.27
  5. Step 5: Solve for x
    x = 182,023.27/468.21
  6. Step 6: Final answer
    x = 388.76

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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.