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Finding the Fourth Proportional to 874.49, 1,311.68 and 216.36

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Solution

The fourth proportional to 874.49, 1,311.68 and 216.36 is: 324.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.49 : 1,311.68 = 216.36 : x
  2. Step 2: Convert to fraction form
    874.49/1,311.68 = 216.36/x
  3. Step 3: Cross multiply
    874.49x = 1,311.68 × 216.36
  4. Step 4: Simplify right side
    874.49x = 283,795.63
  5. Step 5: Solve for x
    x = 283,795.63/874.49
  6. Step 6: Final answer
    x = 324.53

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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.