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Finding the Fourth Proportional to 571.66, 788.89 and 309.68

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Solution

The fourth proportional to 571.66, 788.89 and 309.68 is: 427.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.66 : 788.89 = 309.68 : x
  2. Step 2: Convert to fraction form
    571.66/788.89 = 309.68/x
  3. Step 3: Cross multiply
    571.66x = 788.89 × 309.68
  4. Step 4: Simplify right side
    571.66x = 244,303.46
  5. Step 5: Solve for x
    x = 244,303.46/571.66
  6. Step 6: Final answer
    x = 427.36

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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.