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Finding the Fourth Proportional to 199.58, 275.63 and 155.85

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Solution

The fourth proportional to 199.58, 275.63 and 155.85 is: 215.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.58 : 275.63 = 155.85 : x
  2. Step 2: Convert to fraction form
    199.58/275.63 = 155.85/x
  3. Step 3: Cross multiply
    199.58x = 275.63 × 155.85
  4. Step 4: Simplify right side
    199.58x = 42,955.12
  5. Step 5: Solve for x
    x = 42,955.12/199.58
  6. Step 6: Final answer
    x = 215.23

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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.