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Finding the Fourth Proportional to 648.85, 975.30 and 636.70

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Solution

The fourth proportional to 648.85, 975.30 and 636.70 is: 957.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.85 : 975.30 = 636.70 : x
  2. Step 2: Convert to fraction form
    648.85/975.30 = 636.70/x
  3. Step 3: Cross multiply
    648.85x = 975.30 × 636.70
  4. Step 4: Simplify right side
    648.85x = 620,973.51
  5. Step 5: Solve for x
    x = 620,973.51/648.85
  6. Step 6: Final answer
    x = 957.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.