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Finding the Fourth Proportional to 608.40, 911.19 and 391.32

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Solution

The fourth proportional to 608.40, 911.19 and 391.32 is: 586.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 911.19 = 391.32 : x
  2. Step 2: Convert to fraction form
    608.40/911.19 = 391.32/x
  3. Step 3: Cross multiply
    608.40x = 911.19 × 391.32
  4. Step 4: Simplify right side
    608.40x = 356,566.87
  5. Step 5: Solve for x
    x = 356,566.87/608.40
  6. Step 6: Final answer
    x = 586.07

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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.