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Finding the Fourth Proportional to 818.55, 1,226.93 and 407.79

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Solution

The fourth proportional to 818.55, 1,226.93 and 407.79 is: 611.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.55 : 1,226.93 = 407.79 : x
  2. Step 2: Convert to fraction form
    818.55/1,226.93 = 407.79/x
  3. Step 3: Cross multiply
    818.55x = 1,226.93 × 407.79
  4. Step 4: Simplify right side
    818.55x = 500,327.75
  5. Step 5: Solve for x
    x = 500,327.75/818.55
  6. Step 6: Final answer
    x = 611.24

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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.