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Finding the Fourth Proportional to 486.09, 729.15 and 161.40

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Solution

The fourth proportional to 486.09, 729.15 and 161.40 is: 242.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.09 : 729.15 = 161.40 : x
  2. Step 2: Convert to fraction form
    486.09/729.15 = 161.40/x
  3. Step 3: Cross multiply
    486.09x = 729.15 × 161.40
  4. Step 4: Simplify right side
    486.09x = 117,684.81
  5. Step 5: Solve for x
    x = 117,684.81/486.09
  6. Step 6: Final answer
    x = 242.10

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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.