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Finding the Fourth Proportional to 315.11, 435.39 and 304.03

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Solution

The fourth proportional to 315.11, 435.39 and 304.03 is: 420.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.11 : 435.39 = 304.03 : x
  2. Step 2: Convert to fraction form
    315.11/435.39 = 304.03/x
  3. Step 3: Cross multiply
    315.11x = 435.39 × 304.03
  4. Step 4: Simplify right side
    315.11x = 132,370.29
  5. Step 5: Solve for x
    x = 132,370.29/315.11
  6. Step 6: Final answer
    x = 420.07

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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.