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Finding the Fourth Proportional to 643.88, 965.55 and 248.51

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Solution

The fourth proportional to 643.88, 965.55 and 248.51 is: 372.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.88 : 965.55 = 248.51 : x
  2. Step 2: Convert to fraction form
    643.88/965.55 = 248.51/x
  3. Step 3: Cross multiply
    643.88x = 965.55 × 248.51
  4. Step 4: Simplify right side
    643.88x = 239,944.00
  5. Step 5: Solve for x
    x = 239,944.00/643.88
  6. Step 6: Final answer
    x = 372.66

Related Problems

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Half scale
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Double scale
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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.