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Finding the Fourth Proportional to 648.50, 972.75 and 263.75

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Solution

The fourth proportional to 648.50, 972.75 and 263.75 is: 395.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.50 : 972.75 = 263.75 : x
  2. Step 2: Convert to fraction form
    648.50/972.75 = 263.75/x
  3. Step 3: Cross multiply
    648.50x = 972.75 × 263.75
  4. Step 4: Simplify right side
    648.50x = 256,562.81
  5. Step 5: Solve for x
    x = 256,562.81/648.50
  6. Step 6: Final answer
    x = 395.63

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Double scale
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Similar ratio
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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.