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Finding the Fourth Proportional to 608.60, 912.81 and 218.90

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Solution

The fourth proportional to 608.60, 912.81 and 218.90 is: 328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.60 : 912.81 = 218.90 : x
  2. Step 2: Convert to fraction form
    608.60/912.81 = 218.90/x
  3. Step 3: Cross multiply
    608.60x = 912.81 × 218.90
  4. Step 4: Simplify right side
    608.60x = 199,814.11
  5. Step 5: Solve for x
    x = 199,814.11/608.60
  6. Step 6: Final answer
    x = 328.32

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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.