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Finding the Fourth Proportional to 643.75, 965.66 and 181.49

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Solution

The fourth proportional to 643.75, 965.66 and 181.49 is: 272.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.75 : 965.66 = 181.49 : x
  2. Step 2: Convert to fraction form
    643.75/965.66 = 181.49/x
  3. Step 3: Cross multiply
    643.75x = 965.66 × 181.49
  4. Step 4: Simplify right side
    643.75x = 175,257.63
  5. Step 5: Solve for x
    x = 175,257.63/643.75
  6. Step 6: Final answer
    x = 272.24

Related Problems

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Half scale
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Double scale
Find fourth proportional to 644.75, 967.16 and 182.49
Similar ratio
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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.