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Finding the Fourth Proportional to 818.93, 1,228.53 and 407.99

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Solution

The fourth proportional to 818.93, 1,228.53 and 407.99 is: 612.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.93 : 1,228.53 = 407.99 : x
  2. Step 2: Convert to fraction form
    818.93/1,228.53 = 407.99/x
  3. Step 3: Cross multiply
    818.93x = 1,228.53 × 407.99
  4. Step 4: Simplify right side
    818.93x = 501,221.81
  5. Step 5: Solve for x
    x = 501,221.81/818.93
  6. Step 6: Final answer
    x = 612.05

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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.