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Finding the Third Proportional to 239.81 and 478.13

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Solution

The third proportional to 239.81 and 478.13 is: 953.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.81 : 478.13 = 478.13 : x
  2. Step 2: Convert to fraction form
    239.81/478.13 = 478.13/x
  3. Step 3: Cross multiply
    239.81x = 478.13 × 478.13
  4. Step 4: Simplify right side
    239.81x = 228,603.52
  5. Step 5: Solve for x
    x = 228,603.52/239.81
  6. Step 6: Final answer
    x = 953.26

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Why These Related Problems?

These problems maintain the same ratio (1.99) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.