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Finding the Fourth Proportional to 515.74, 711.58 and 319.35

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Solution

The fourth proportional to 515.74, 711.58 and 319.35 is: 440.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.74 : 711.58 = 319.35 : x
  2. Step 2: Convert to fraction form
    515.74/711.58 = 319.35/x
  3. Step 3: Cross multiply
    515.74x = 711.58 × 319.35
  4. Step 4: Simplify right side
    515.74x = 227,243.07
  5. Step 5: Solve for x
    x = 227,243.07/515.74
  6. Step 6: Final answer
    x = 440.62

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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.