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Finding the Fourth Proportional to 649.20, 973.40 and 259.26

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Solution

The fourth proportional to 649.20, 973.40 and 259.26 is: 388.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.20 : 973.40 = 259.26 : x
  2. Step 2: Convert to fraction form
    649.20/973.40 = 259.26/x
  3. Step 3: Cross multiply
    649.20x = 973.40 × 259.26
  4. Step 4: Simplify right side
    649.20x = 252,363.68
  5. Step 5: Solve for x
    x = 252,363.68/649.20
  6. Step 6: Final answer
    x = 388.73

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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.