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Finding the Fourth Proportional to 492.66, 679.80 and 285.66

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Solution

The fourth proportional to 492.66, 679.80 and 285.66 is: 394.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.66 : 679.80 = 285.66 : x
  2. Step 2: Convert to fraction form
    492.66/679.80 = 285.66/x
  3. Step 3: Cross multiply
    492.66x = 679.80 × 285.66
  4. Step 4: Simplify right side
    492.66x = 194,191.67
  5. Step 5: Solve for x
    x = 194,191.67/492.66
  6. Step 6: Final answer
    x = 394.17

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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.