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Finding the Fourth Proportional to 315.11, 435.19 and 280.76

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Solution

The fourth proportional to 315.11, 435.19 and 280.76 is: 387.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.11 : 435.19 = 280.76 : x
  2. Step 2: Convert to fraction form
    315.11/435.19 = 280.76/x
  3. Step 3: Cross multiply
    315.11x = 435.19 × 280.76
  4. Step 4: Simplify right side
    315.11x = 122,180.36
  5. Step 5: Solve for x
    x = 122,180.36/315.11
  6. Step 6: Final answer
    x = 387.74

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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.