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Finding the Fourth Proportional to 199.64, 275.33 and 155.30

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Solution

The fourth proportional to 199.64, 275.33 and 155.30 is: 214.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.64 : 275.33 = 155.30 : x
  2. Step 2: Convert to fraction form
    199.64/275.33 = 155.30/x
  3. Step 3: Cross multiply
    199.64x = 275.33 × 155.30
  4. Step 4: Simplify right side
    199.64x = 42,756.60
  5. Step 5: Solve for x
    x = 42,756.60/199.64
  6. Step 6: Final answer
    x = 214.17

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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.