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Finding the Fourth Proportional to 453.51, 679.86 and 261

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Solution

The fourth proportional to 453.51, 679.86 and 261 is: 391.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.51 : 679.86 = 261 : x
  2. Step 2: Convert to fraction form
    453.51/679.86 = 261/x
  3. Step 3: Cross multiply
    453.51x = 679.86 × 261
  4. Step 4: Simplify right side
    453.51x = 177,443.46
  5. Step 5: Solve for x
    x = 177,443.46/453.51
  6. Step 6: Final answer
    x = 391.27

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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.