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Finding the Fourth Proportional to 86.74, 130.67 and 65.50

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Solution

The fourth proportional to 86.74, 130.67 and 65.50 is: 98.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.74 : 130.67 = 65.50 : x
  2. Step 2: Convert to fraction form
    86.74/130.67 = 65.50/x
  3. Step 3: Cross multiply
    86.74x = 130.67 × 65.50
  4. Step 4: Simplify right side
    86.74x = 8,558.89
  5. Step 5: Solve for x
    x = 8,558.89/86.74
  6. Step 6: Final answer
    x = 98.67

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.