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Finding the Fourth Proportional to 86.45, 119.31 and 47.64

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Solution

The fourth proportional to 86.45, 119.31 and 47.64 is: 65.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.45 : 119.31 = 47.64 : x
  2. Step 2: Convert to fraction form
    86.45/119.31 = 47.64/x
  3. Step 3: Cross multiply
    86.45x = 119.31 × 47.64
  4. Step 4: Simplify right side
    86.45x = 5,683.81
  5. Step 5: Solve for x
    x = 5,683.81/86.45
  6. Step 6: Final answer
    x = 65.74

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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.