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Finding the Fourth Proportional to 491.96, 679.02 and 282.20

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Solution

The fourth proportional to 491.96, 679.02 and 282.20 is: 389.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.96 : 679.02 = 282.20 : x
  2. Step 2: Convert to fraction form
    491.96/679.02 = 282.20/x
  3. Step 3: Cross multiply
    491.96x = 679.02 × 282.20
  4. Step 4: Simplify right side
    491.96x = 191,616.05
  5. Step 5: Solve for x
    x = 191,616.05/491.96
  6. Step 6: Final answer
    x = 389.50

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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.