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Finding the Fourth Proportional to 646.30, 891.92 and 351.58

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Solution

The fourth proportional to 646.30, 891.92 and 351.58 is: 485.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.30 : 891.92 = 351.58 : x
  2. Step 2: Convert to fraction form
    646.30/891.92 = 351.58/x
  3. Step 3: Cross multiply
    646.30x = 891.92 × 351.58
  4. Step 4: Simplify right side
    646.30x = 313,581.23
  5. Step 5: Solve for x
    x = 313,581.23/646.30
  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.