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Finding the Fourth Proportional to 812.48, 1,121 and 480.76

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Solution

The fourth proportional to 812.48, 1,121 and 480.76 is: 663.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.48 : 1,121 = 480.76 : x
  2. Step 2: Convert to fraction form
    812.48/1,121 = 480.76/x
  3. Step 3: Cross multiply
    812.48x = 1,121 × 480.76
  4. Step 4: Simplify right side
    812.48x = 538,931.96
  5. Step 5: Solve for x
    x = 538,931.96/812.48
  6. Step 6: Final answer
    x = 663.32

Related Problems

Find fourth proportional to 406.24, 560.50 and 240.38
Half scale
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Double scale
Find fourth proportional to 813.48, 1,122.38 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.