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Finding the Fourth Proportional to 608.91, 912.90 and 197.80

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Solution

The fourth proportional to 608.91, 912.90 and 197.80 is: 296.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.91 : 912.90 = 197.80 : x
  2. Step 2: Convert to fraction form
    608.91/912.90 = 197.80/x
  3. Step 3: Cross multiply
    608.91x = 912.90 × 197.80
  4. Step 4: Simplify right side
    608.91x = 180,570.08
  5. Step 5: Solve for x
    x = 180,570.08/608.91
  6. Step 6: Final answer
    x = 296.55

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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.