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Finding the Fourth Proportional to 492.71, 679.74 and 306.28

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Solution

The fourth proportional to 492.71, 679.74 and 306.28 is: 422.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.71 : 679.74 = 306.28 : x
  2. Step 2: Convert to fraction form
    492.71/679.74 = 306.28/x
  3. Step 3: Cross multiply
    492.71x = 679.74 × 306.28
  4. Step 4: Simplify right side
    492.71x = 208,192.19
  5. Step 5: Solve for x
    x = 208,192.19/492.71
  6. Step 6: Final answer
    x = 422.55

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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.