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Finding the Fourth Proportional to 643.66, 965.64 and 181.44

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Solution

The fourth proportional to 643.66, 965.64 and 181.44 is: 272.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.66 : 965.64 = 181.44 : x
  2. Step 2: Convert to fraction form
    643.66/965.64 = 181.44/x
  3. Step 3: Cross multiply
    643.66x = 965.64 × 181.44
  4. Step 4: Simplify right side
    643.66x = 175,205.72
  5. Step 5: Solve for x
    x = 175,205.72/643.66
  6. Step 6: Final answer
    x = 272.20

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1.5x scale

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.