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Finding the Fourth Proportional to 170.86, 235.60 and 121.11

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Solution

The fourth proportional to 170.86, 235.60 and 121.11 is: 167.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.86 : 235.60 = 121.11 : x
  2. Step 2: Convert to fraction form
    170.86/235.60 = 121.11/x
  3. Step 3: Cross multiply
    170.86x = 235.60 × 121.11
  4. Step 4: Simplify right side
    170.86x = 28,533.52
  5. Step 5: Solve for x
    x = 28,533.52/170.86
  6. Step 6: Final answer
    x = 167.00

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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.