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Finding the Fourth Proportional to 812.76, 1,121.76 and 481.08

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Solution

The fourth proportional to 812.76, 1,121.76 and 481.08 is: 663.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.76 : 1,121.76 = 481.08 : x
  2. Step 2: Convert to fraction form
    812.76/1,121.76 = 481.08/x
  3. Step 3: Cross multiply
    812.76x = 1,121.76 × 481.08
  4. Step 4: Simplify right side
    812.76x = 539,656.30
  5. Step 5: Solve for x
    x = 539,656.30/812.76
  6. Step 6: Final answer
    x = 663.98

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Find fourth proportional to 406.38, 560.88 and 240.54
Half scale
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Double scale
Find fourth proportional to 813.76, 1,123.14 and 482.08
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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.