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Finding the Fourth Proportional to 494.84, 682.88 and 308.40

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Solution

The fourth proportional to 494.84, 682.88 and 308.40 is: 425.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.84 : 682.88 = 308.40 : x
  2. Step 2: Convert to fraction form
    494.84/682.88 = 308.40/x
  3. Step 3: Cross multiply
    494.84x = 682.88 × 308.40
  4. Step 4: Simplify right side
    494.84x = 210,602.67
  5. Step 5: Solve for x
    x = 210,602.67/494.84
  6. Step 6: Final answer
    x = 425.60

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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.