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Finding the Fourth Proportional to 389.85, 537.10 and 319.92

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Solution

The fourth proportional to 389.85, 537.10 and 319.92 is: 440.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.85 : 537.10 = 319.92 : x
  2. Step 2: Convert to fraction form
    389.85/537.10 = 319.92/x
  3. Step 3: Cross multiply
    389.85x = 537.10 × 319.92
  4. Step 4: Simplify right side
    389.85x = 171,829.03
  5. Step 5: Solve for x
    x = 171,829.03/389.85
  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.