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Finding the Fourth Proportional to 389.40, 537.30 and 240.12

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Solution

The fourth proportional to 389.40, 537.30 and 240.12 is: 331.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.40 : 537.30 = 240.12 : x
  2. Step 2: Convert to fraction form
    389.40/537.30 = 240.12/x
  3. Step 3: Cross multiply
    389.40x = 537.30 × 240.12
  4. Step 4: Simplify right side
    389.40x = 129,016.48
  5. Step 5: Solve for x
    x = 129,016.48/389.40
  6. Step 6: Final answer
    x = 331.32

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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.