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Finding the Fourth Proportional to 515.83, 711.99 and 319.23

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Solution

The fourth proportional to 515.83, 711.99 and 319.23 is: 440.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.83 : 711.99 = 319.23 : x
  2. Step 2: Convert to fraction form
    515.83/711.99 = 319.23/x
  3. Step 3: Cross multiply
    515.83x = 711.99 × 319.23
  4. Step 4: Simplify right side
    515.83x = 227,290.04
  5. Step 5: Solve for x
    x = 227,290.04/515.83
  6. Step 6: Final answer
    x = 440.63

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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.