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Finding the Fourth Proportional to 812.18, 1,120.74 and 480.55

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Solution

The fourth proportional to 812.18, 1,120.74 and 480.55 is: 663.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.18 : 1,120.74 = 480.55 : x
  2. Step 2: Convert to fraction form
    812.18/1,120.74 = 480.55/x
  3. Step 3: Cross multiply
    812.18x = 1,120.74 × 480.55
  4. Step 4: Simplify right side
    812.18x = 538,564.38
  5. Step 5: Solve for x
    x = 538,564.38/812.18
  6. Step 6: Final answer
    x = 663.11

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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.