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Finding the Fourth Proportional to 648.75, 973.16 and 161.81

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Solution

The fourth proportional to 648.75, 973.16 and 161.81 is: 242.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.75 : 973.16 = 161.81 : x
  2. Step 2: Convert to fraction form
    648.75/973.16 = 161.81/x
  3. Step 3: Cross multiply
    648.75x = 973.16 × 161.81
  4. Step 4: Simplify right side
    648.75x = 157,461.34
  5. Step 5: Solve for x
    x = 157,461.34/648.75
  6. Step 6: Final answer
    x = 242.71

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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.