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Finding the Fourth Proportional to 486.61, 729.75 and 212.62

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Solution

The fourth proportional to 486.61, 729.75 and 212.62 is: 318.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.61 : 729.75 = 212.62 : x
  2. Step 2: Convert to fraction form
    486.61/729.75 = 212.62/x
  3. Step 3: Cross multiply
    486.61x = 729.75 × 212.62
  4. Step 4: Simplify right side
    486.61x = 155,159.45
  5. Step 5: Solve for x
    x = 155,159.45/486.61
  6. Step 6: Final answer
    x = 318.86

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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.