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Finding the Fourth Proportional to 608.70, 911.28 and 389.58

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Solution

The fourth proportional to 608.70, 911.28 and 389.58 is: 583.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.70 : 911.28 = 389.58 : x
  2. Step 2: Convert to fraction form
    608.70/911.28 = 389.58/x
  3. Step 3: Cross multiply
    608.70x = 911.28 × 389.58
  4. Step 4: Simplify right side
    608.70x = 355,014.51
  5. Step 5: Solve for x
    x = 355,014.51/608.70
  6. Step 6: Final answer
    x = 583.24

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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.