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Finding the Fourth Proportional to 818.42, 1,227.15 and 561.62

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Solution

The fourth proportional to 818.42, 1,227.15 and 561.62 is: 842.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.42 : 1,227.15 = 561.62 : x
  2. Step 2: Convert to fraction form
    818.42/1,227.15 = 561.62/x
  3. Step 3: Cross multiply
    818.42x = 1,227.15 × 561.62
  4. Step 4: Simplify right side
    818.42x = 689,191.98
  5. Step 5: Solve for x
    x = 689,191.98/818.42
  6. Step 6: Final answer
    x = 842.10

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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.