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Finding the Fourth Proportional to 315.54, 435.48 and 280.29

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Solution

The fourth proportional to 315.54, 435.48 and 280.29 is: 386.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.54 : 435.48 = 280.29 : x
  2. Step 2: Convert to fraction form
    315.54/435.48 = 280.29/x
  3. Step 3: Cross multiply
    315.54x = 435.48 × 280.29
  4. Step 4: Simplify right side
    315.54x = 122,060.69
  5. Step 5: Solve for x
    x = 122,060.69/315.54
  6. Step 6: Final answer
    x = 386.83

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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.