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Finding the Fourth Proportional to 309.31, 463.80 and 103.80

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Solution

The fourth proportional to 309.31, 463.80 and 103.80 is: 155.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.31 : 463.80 = 103.80 : x
  2. Step 2: Convert to fraction form
    309.31/463.80 = 103.80/x
  3. Step 3: Cross multiply
    309.31x = 463.80 × 103.80
  4. Step 4: Simplify right side
    309.31x = 48,142.44
  5. Step 5: Solve for x
    x = 48,142.44/309.31
  6. Step 6: Final answer
    x = 155.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.