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Finding the Fourth Proportional to 486.57, 729.61 and 212.54

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Solution

The fourth proportional to 486.57, 729.61 and 212.54 is: 318.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.57 : 729.61 = 212.54 : x
  2. Step 2: Convert to fraction form
    486.57/729.61 = 212.54/x
  3. Step 3: Cross multiply
    486.57x = 729.61 × 212.54
  4. Step 4: Simplify right side
    486.57x = 155,071.31
  5. Step 5: Solve for x
    x = 155,071.31/486.57
  6. Step 6: Final answer
    x = 318.70

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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.