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Finding the Fourth Proportional to 217.42, 299.90 and 155.32

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Solution

The fourth proportional to 217.42, 299.90 and 155.32 is: 214.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.42 : 299.90 = 155.32 : x
  2. Step 2: Convert to fraction form
    217.42/299.90 = 155.32/x
  3. Step 3: Cross multiply
    217.42x = 299.90 × 155.32
  4. Step 4: Simplify right side
    217.42x = 46,580.11
  5. Step 5: Solve for x
    x = 46,580.11/217.42
  6. Step 6: Final answer
    x = 214.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.