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Finding the Fourth Proportional to 648.30, 971.10 and 485.76

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Solution

The fourth proportional to 648.30, 971.10 and 485.76 is: 727.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.30 : 971.10 = 485.76 : x
  2. Step 2: Convert to fraction form
    648.30/971.10 = 485.76/x
  3. Step 3: Cross multiply
    648.30x = 971.10 × 485.76
  4. Step 4: Simplify right side
    648.30x = 471,721.54
  5. Step 5: Solve for x
    x = 471,721.54/648.30
  6. Step 6: Final answer
    x = 727.63

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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.