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Finding the Fourth Proportional to 518.81, 715.63 and 319.54

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Solution

The fourth proportional to 518.81, 715.63 and 319.54 is: 440.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.81 : 715.63 = 319.54 : x
  2. Step 2: Convert to fraction form
    518.81/715.63 = 319.54/x
  3. Step 3: Cross multiply
    518.81x = 715.63 × 319.54
  4. Step 4: Simplify right side
    518.81x = 228,672.41
  5. Step 5: Solve for x
    x = 228,672.41/518.81
  6. Step 6: Final answer
    x = 440.76

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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.