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Finding the Fourth Proportional to 486.48, 729.40 and 212.40

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Solution

The fourth proportional to 486.48, 729.40 and 212.40 is: 318.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.48 : 729.40 = 212.40 : x
  2. Step 2: Convert to fraction form
    486.48/729.40 = 212.40/x
  3. Step 3: Cross multiply
    486.48x = 729.40 × 212.40
  4. Step 4: Simplify right side
    486.48x = 154,924.56
  5. Step 5: Solve for x
    x = 154,924.56/486.48
  6. Step 6: Final answer
    x = 318.46

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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.