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Finding the Fourth Proportional to 646.10, 891.62 and 366.39

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Solution

The fourth proportional to 646.10, 891.62 and 366.39 is: 505.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.10 : 891.62 = 366.39 : x
  2. Step 2: Convert to fraction form
    646.10/891.62 = 366.39/x
  3. Step 3: Cross multiply
    646.10x = 891.62 × 366.39
  4. Step 4: Simplify right side
    646.10x = 326,674.36
  5. Step 5: Solve for x
    x = 326,674.36/646.10
  6. Step 6: Final answer
    x = 505.61

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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.