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Finding the Fourth Proportional to 492.78, 680.07 and 318.06

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Solution

The fourth proportional to 492.78, 680.07 and 318.06 is: 438.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.78 : 680.07 = 318.06 : x
  2. Step 2: Convert to fraction form
    492.78/680.07 = 318.06/x
  3. Step 3: Cross multiply
    492.78x = 680.07 × 318.06
  4. Step 4: Simplify right side
    492.78x = 216,303.06
  5. Step 5: Solve for x
    x = 216,303.06/492.78
  6. Step 6: Final answer
    x = 438.94

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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.