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Finding the Fourth Proportional to 199.89, 275.67 and 156.15

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Solution

The fourth proportional to 199.89, 275.67 and 156.15 is: 215.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.89 : 275.67 = 156.15 : x
  2. Step 2: Convert to fraction form
    199.89/275.67 = 156.15/x
  3. Step 3: Cross multiply
    199.89x = 275.67 × 156.15
  4. Step 4: Simplify right side
    199.89x = 43,045.87
  5. Step 5: Solve for x
    x = 43,045.87/199.89
  6. Step 6: Final answer
    x = 215.35

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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.