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Finding the Fourth Proportional to 660.26, 911.58 and 485.30

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Solution

The fourth proportional to 660.26, 911.58 and 485.30 is: 670.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.26 : 911.58 = 485.30 : x
  2. Step 2: Convert to fraction form
    660.26/911.58 = 485.30/x
  3. Step 3: Cross multiply
    660.26x = 911.58 × 485.30
  4. Step 4: Simplify right side
    660.26x = 442,389.77
  5. Step 5: Solve for x
    x = 442,389.77/660.26
  6. Step 6: Final answer
    x = 670.02

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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.