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Finding the Fourth Proportional to 571.33, 788.31 and 438.70

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Solution

The fourth proportional to 571.33, 788.31 and 438.70 is: 605.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.33 : 788.31 = 438.70 : x
  2. Step 2: Convert to fraction form
    571.33/788.31 = 438.70/x
  3. Step 3: Cross multiply
    571.33x = 788.31 × 438.70
  4. Step 4: Simplify right side
    571.33x = 345,831.60
  5. Step 5: Solve for x
    x = 345,831.60/571.33
  6. Step 6: Final answer
    x = 605.31

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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.