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Finding the Fourth Proportional to 818.36, 1,228.62 and 385.28

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Solution

The fourth proportional to 818.36, 1,228.62 and 385.28 is: 578.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.36 : 1,228.62 = 385.28 : x
  2. Step 2: Convert to fraction form
    818.36/1,228.62 = 385.28/x
  3. Step 3: Cross multiply
    818.36x = 1,228.62 × 385.28
  4. Step 4: Simplify right side
    818.36x = 473,362.71
  5. Step 5: Solve for x
    x = 473,362.71/818.36
  6. Step 6: Final answer
    x = 578.43

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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.