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Finding the Fourth Proportional to 515.58, 711.90 and 319.43

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Solution

The fourth proportional to 515.58, 711.90 and 319.43 is: 441.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.58 : 711.90 = 319.43 : x
  2. Step 2: Convert to fraction form
    515.58/711.90 = 319.43/x
  3. Step 3: Cross multiply
    515.58x = 711.90 × 319.43
  4. Step 4: Simplify right side
    515.58x = 227,398.66
  5. Step 5: Solve for x
    x = 227,398.66/515.58
  6. Step 6: Final answer
    x = 441.05

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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.