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Finding the Fourth Proportional to 492.58, 679.80 and 282.79

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Solution

The fourth proportional to 492.58, 679.80 and 282.79 is: 390.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.58 : 679.80 = 282.79 : x
  2. Step 2: Convert to fraction form
    492.58/679.80 = 282.79/x
  3. Step 3: Cross multiply
    492.58x = 679.80 × 282.79
  4. Step 4: Simplify right side
    492.58x = 192,240.64
  5. Step 5: Solve for x
    x = 192,240.64/492.58
  6. Step 6: Final answer
    x = 390.27

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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.