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Finding the Fourth Proportional to 492.56, 679.59 and 282.72

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Solution

The fourth proportional to 492.56, 679.59 and 282.72 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.56 : 679.59 = 282.72 : x
  2. Step 2: Convert to fraction form
    492.56/679.59 = 282.72/x
  3. Step 3: Cross multiply
    492.56x = 679.59 × 282.72
  4. Step 4: Simplify right side
    492.56x = 192,133.68
  5. Step 5: Solve for x
    x = 192,133.68/492.56
  6. Step 6: Final answer
    x = 390.08

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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.