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Finding the Fourth Proportional to 309.20, 463.75 and 103.75

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Solution

The fourth proportional to 309.20, 463.75 and 103.75 is: 155.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.20 : 463.75 = 103.75 : x
  2. Step 2: Convert to fraction form
    309.20/463.75 = 103.75/x
  3. Step 3: Cross multiply
    309.20x = 463.75 × 103.75
  4. Step 4: Simplify right side
    309.20x = 48,112.64
  5. Step 5: Solve for x
    x = 48,112.64/309.20
  6. Step 6: Final answer
    x = 155.61

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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.