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Finding the Fourth Proportional to 373.89, 515.54 and 318.81

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Solution

The fourth proportional to 373.89, 515.54 and 318.81 is: 439.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    373.89 : 515.54 = 318.81 : x
  2. Step 2: Convert to fraction form
    373.89/515.54 = 318.81/x
  3. Step 3: Cross multiply
    373.89x = 515.54 × 318.81
  4. Step 4: Simplify right side
    373.89x = 164,357.71
  5. Step 5: Solve for x
    x = 164,357.71/373.89
  6. Step 6: Final answer
    x = 439.59

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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.