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Finding the Fourth Proportional to 571.25, 855.86 and 387.99

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Solution

The fourth proportional to 571.25, 855.86 and 387.99 is: 581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.25 : 855.86 = 387.99 : x
  2. Step 2: Convert to fraction form
    571.25/855.86 = 387.99/x
  3. Step 3: Cross multiply
    571.25x = 855.86 × 387.99
  4. Step 4: Simplify right side
    571.25x = 332,065.12
  5. Step 5: Solve for x
    x = 332,065.12/571.25
  6. Step 6: Final answer
    x = 581.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.