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Finding the Fourth Proportional to 812.44, 1,120.98 and 480.76

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Solution

The fourth proportional to 812.44, 1,120.98 and 480.76 is: 663.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.44 : 1,120.98 = 480.76 : x
  2. Step 2: Convert to fraction form
    812.44/1,120.98 = 480.76/x
  3. Step 3: Cross multiply
    812.44x = 1,120.98 × 480.76
  4. Step 4: Simplify right side
    812.44x = 538,922.34
  5. Step 5: Solve for x
    x = 538,922.34/812.44
  6. Step 6: Final answer
    x = 663.34

Related Problems

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Half scale
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Double scale
Find fourth proportional to 813.44, 1,122.36 and 481.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.