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Finding the Fourth Proportional to 510.69, 704.78 and 289.65

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Solution

The fourth proportional to 510.69, 704.78 and 289.65 is: 399.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.69 : 704.78 = 289.65 : x
  2. Step 2: Convert to fraction form
    510.69/704.78 = 289.65/x
  3. Step 3: Cross multiply
    510.69x = 704.78 × 289.65
  4. Step 4: Simplify right side
    510.69x = 204,138.08
  5. Step 5: Solve for x
    x = 204,138.08/510.69
  6. Step 6: Final answer
    x = 399.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.