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Finding the Fourth Proportional to 646.21, 969.45 and 628.39

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Solution

The fourth proportional to 646.21, 969.45 and 628.39 is: 942.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.21 : 969.45 = 628.39 : x
  2. Step 2: Convert to fraction form
    646.21/969.45 = 628.39/x
  3. Step 3: Cross multiply
    646.21x = 969.45 × 628.39
  4. Step 4: Simplify right side
    646.21x = 609,192.69
  5. Step 5: Solve for x
    x = 609,192.69/646.21
  6. Step 6: Final answer
    x = 942.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.