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Finding the Fourth Proportional to 571.55, 788.78 and 319.51

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Solution

The fourth proportional to 571.55, 788.78 and 319.51 is: 440.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.55 : 788.78 = 319.51 : x
  2. Step 2: Convert to fraction form
    571.55/788.78 = 319.51/x
  3. Step 3: Cross multiply
    571.55x = 788.78 × 319.51
  4. Step 4: Simplify right side
    571.55x = 252,019.53
  5. Step 5: Solve for x
    x = 252,019.53/571.55
  6. Step 6: Final answer
    x = 440.94

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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.