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Finding the Fourth Proportional to 492.40, 679.40 and 282.54

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Solution

The fourth proportional to 492.40, 679.40 and 282.54 is: 389.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.40 : 679.40 = 282.54 : x
  2. Step 2: Convert to fraction form
    492.40/679.40 = 282.54/x
  3. Step 3: Cross multiply
    492.40x = 679.40 × 282.54
  4. Step 4: Simplify right side
    492.40x = 191,957.68
  5. Step 5: Solve for x
    x = 191,957.68/492.40
  6. Step 6: Final answer
    x = 389.84

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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.