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Finding the Fourth Proportional to 812.42, 1,219.29 and 374.16

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Solution

The fourth proportional to 812.42, 1,219.29 and 374.16 is: 561.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.42 : 1,219.29 = 374.16 : x
  2. Step 2: Convert to fraction form
    812.42/1,219.29 = 374.16/x
  3. Step 3: Cross multiply
    812.42x = 1,219.29 × 374.16
  4. Step 4: Simplify right side
    812.42x = 456,209.55
  5. Step 5: Solve for x
    x = 456,209.55/812.42
  6. Step 6: Final answer
    x = 561.54

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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.