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Finding the Fourth Proportional to 608.40, 911.52 and 391.68

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Solution

The fourth proportional to 608.40, 911.52 and 391.68 is: 586.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 911.52 = 391.68 : x
  2. Step 2: Convert to fraction form
    608.40/911.52 = 391.68/x
  3. Step 3: Cross multiply
    608.40x = 911.52 × 391.68
  4. Step 4: Simplify right side
    608.40x = 357,024.15
  5. Step 5: Solve for x
    x = 357,024.15/608.40
  6. Step 6: Final answer
    x = 586.82

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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.