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Finding the Fourth Proportional to 811.51, 1,217.31 and 324.49

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Solution

The fourth proportional to 811.51, 1,217.31 and 324.49 is: 486.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.51 : 1,217.31 = 324.49 : x
  2. Step 2: Convert to fraction form
    811.51/1,217.31 = 324.49/x
  3. Step 3: Cross multiply
    811.51x = 1,217.31 × 324.49
  4. Step 4: Simplify right side
    811.51x = 395,004.92
  5. Step 5: Solve for x
    x = 395,004.92/811.51
  6. Step 6: Final answer
    x = 486.75

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.