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Finding the Fourth Proportional to 571.69, 788.94 and 309.71

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Solution

The fourth proportional to 571.69, 788.94 and 309.71 is: 427.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.69 : 788.94 = 309.71 : x
  2. Step 2: Convert to fraction form
    571.69/788.94 = 309.71/x
  3. Step 3: Cross multiply
    571.69x = 788.94 × 309.71
  4. Step 4: Simplify right side
    571.69x = 244,341.49
  5. Step 5: Solve for x
    x = 244,341.49/571.69
  6. Step 6: Final answer
    x = 427.40

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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.