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Finding the Fourth Proportional to 381.11, 525.69 and 315.50

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Solution

The fourth proportional to 381.11, 525.69 and 315.50 is: 435.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.11 : 525.69 = 315.50 : x
  2. Step 2: Convert to fraction form
    381.11/525.69 = 315.50/x
  3. Step 3: Cross multiply
    381.11x = 525.69 × 315.50
  4. Step 4: Simplify right side
    381.11x = 165,852.57
  5. Step 5: Solve for x
    x = 165,852.57/381.11
  6. Step 6: Final answer
    x = 435.19

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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.