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Finding the Fourth Proportional to 660.70, 911.05 and 492.70

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Solution

The fourth proportional to 660.70, 911.05 and 492.70 is: 679.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.70 : 911.05 = 492.70 : x
  2. Step 2: Convert to fraction form
    660.70/911.05 = 492.70/x
  3. Step 3: Cross multiply
    660.70x = 911.05 × 492.70
  4. Step 4: Simplify right side
    660.70x = 448,874.34
  5. Step 5: Solve for x
    x = 448,874.34/660.70
  6. Step 6: Final answer
    x = 679.39

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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.