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Finding the Fourth Proportional to 651.99, 978.36 and 305.49

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Solution

The fourth proportional to 651.99, 978.36 and 305.49 is: 458.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.99 : 978.36 = 305.49 : x
  2. Step 2: Convert to fraction form
    651.99/978.36 = 305.49/x
  3. Step 3: Cross multiply
    651.99x = 978.36 × 305.49
  4. Step 4: Simplify right side
    651.99x = 298,879.20
  5. Step 5: Solve for x
    x = 298,879.20/651.99
  6. Step 6: Final answer
    x = 458.41

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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.