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Finding the Fourth Proportional to 646.23, 891.80 and 351.51

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Solution

The fourth proportional to 646.23, 891.80 and 351.51 is: 485.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.23 : 891.80 = 351.51 : x
  2. Step 2: Convert to fraction form
    646.23/891.80 = 351.51/x
  3. Step 3: Cross multiply
    646.23x = 891.80 × 351.51
  4. Step 4: Simplify right side
    646.23x = 313,474.86
  5. Step 5: Solve for x
    x = 313,474.86/646.23
  6. Step 6: Final answer
    x = 485.08

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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.