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Finding the Fourth Proportional to 152.16, 209.98 and 86.67

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Solution

The fourth proportional to 152.16, 209.98 and 86.67 is: 119.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.16 : 209.98 = 86.67 : x
  2. Step 2: Convert to fraction form
    152.16/209.98 = 86.67/x
  3. Step 3: Cross multiply
    152.16x = 209.98 × 86.67
  4. Step 4: Simplify right side
    152.16x = 18,198.97
  5. Step 5: Solve for x
    x = 18,198.97/152.16
  6. Step 6: Final answer
    x = 119.60

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.