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Finding the Fourth Proportional to 646.76, 969.24 and 338.60

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Solution

The fourth proportional to 646.76, 969.24 and 338.60 is: 507.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.76 : 969.24 = 338.60 : x
  2. Step 2: Convert to fraction form
    646.76/969.24 = 338.60/x
  3. Step 3: Cross multiply
    646.76x = 969.24 × 338.60
  4. Step 4: Simplify right side
    646.76x = 328,184.66
  5. Step 5: Solve for x
    x = 328,184.66/646.76
  6. Step 6: Final answer
    x = 507.43

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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.