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Finding the Fourth Proportional to 571.68, 788.91 and 309.69

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Solution

The fourth proportional to 571.68, 788.91 and 309.69 is: 427.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.68 : 788.91 = 309.69 : x
  2. Step 2: Convert to fraction form
    571.68/788.91 = 309.69/x
  3. Step 3: Cross multiply
    571.68x = 788.91 × 309.69
  4. Step 4: Simplify right side
    571.68x = 244,315.99
  5. Step 5: Solve for x
    x = 244,315.99/571.68
  6. Step 6: Final answer
    x = 427.37

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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.