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Finding the Fourth Proportional to 646.32, 891.92 and 351.59

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Solution

The fourth proportional to 646.32, 891.92 and 351.59 is: 485.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.32 : 891.92 = 351.59 : x
  2. Step 2: Convert to fraction form
    646.32/891.92 = 351.59/x
  3. Step 3: Cross multiply
    646.32x = 891.92 × 351.59
  4. Step 4: Simplify right side
    646.32x = 313,589.29
  5. Step 5: Solve for x
    x = 313,589.29/646.32
  6. Step 6: Final answer
    x = 485.19

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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.