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Finding the Fourth Proportional to 646.48, 892.12 and 351.75

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Solution

The fourth proportional to 646.48, 892.12 and 351.75 is: 485.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.48 : 892.12 = 351.75 : x
  2. Step 2: Convert to fraction form
    646.48/892.12 = 351.75/x
  3. Step 3: Cross multiply
    646.48x = 892.12 × 351.75
  4. Step 4: Simplify right side
    646.48x = 313,803.21
  5. Step 5: Solve for x
    x = 313,803.21/646.48
  6. Step 6: Final answer
    x = 485.40

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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.