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Finding the Fourth Proportional to 571.42, 788.60 and 322.79

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Solution

The fourth proportional to 571.42, 788.60 and 322.79 is: 445.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.42 : 788.60 = 322.79 : x
  2. Step 2: Convert to fraction form
    571.42/788.60 = 322.79/x
  3. Step 3: Cross multiply
    571.42x = 788.60 × 322.79
  4. Step 4: Simplify right side
    571.42x = 254,548.25
  5. Step 5: Solve for x
    x = 254,548.25/571.42
  6. Step 6: Final answer
    x = 445.47

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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.