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Finding the Fourth Proportional to 113.50, 170.05 and 80.93

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Solution

The fourth proportional to 113.50, 170.05 and 80.93 is: 121.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.50 : 170.05 = 80.93 : x
  2. Step 2: Convert to fraction form
    113.50/170.05 = 80.93/x
  3. Step 3: Cross multiply
    113.50x = 170.05 × 80.93
  4. Step 4: Simplify right side
    113.50x = 13,762.15
  5. Step 5: Solve for x
    x = 13,762.15/113.50
  6. Step 6: Final answer
    x = 121.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.