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Finding the Fourth Proportional to 392.51, 541.69 and 217.87

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Solution

The fourth proportional to 392.51, 541.69 and 217.87 is: 300.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.51 : 541.69 = 217.87 : x
  2. Step 2: Convert to fraction form
    392.51/541.69 = 217.87/x
  3. Step 3: Cross multiply
    392.51x = 541.69 × 217.87
  4. Step 4: Simplify right side
    392.51x = 118,016.10
  5. Step 5: Solve for x
    x = 118,016.10/392.51
  6. Step 6: Final answer
    x = 300.67

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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.