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Finding the Fourth Proportional to 647, 969.46 and 386.84

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Solution

The fourth proportional to 647, 969.46 and 386.84 is: 579.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    647 : 969.46 = 386.84 : x
  2. Step 2: Convert to fraction form
    647/969.46 = 386.84/x
  3. Step 3: Cross multiply
    647x = 969.46 × 386.84
  4. Step 4: Simplify right side
    647x = 375,025.91
  5. Step 5: Solve for x
    x = 375,025.91/647
  6. Step 6: Final answer
    x = 579.64

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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.