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Finding the Fourth Proportional to 651.65, 978.82 and 629.78

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Solution

The fourth proportional to 651.65, 978.82 and 629.78 is: 945.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.65 : 978.82 = 629.78 : x
  2. Step 2: Convert to fraction form
    651.65/978.82 = 629.78/x
  3. Step 3: Cross multiply
    651.65x = 978.82 × 629.78
  4. Step 4: Simplify right side
    651.65x = 616,434.79
  5. Step 5: Solve for x
    x = 616,434.79/651.65
  6. Step 6: Final answer
    x = 945.97

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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.