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Finding the Fourth Proportional to 648.40, 971.74 and 282.79

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Solution

The fourth proportional to 648.40, 971.74 and 282.79 is: 423.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.40 : 971.74 = 282.79 : x
  2. Step 2: Convert to fraction form
    648.40/971.74 = 282.79/x
  3. Step 3: Cross multiply
    648.40x = 971.74 × 282.79
  4. Step 4: Simplify right side
    648.40x = 274,792.08
  5. Step 5: Solve for x
    x = 274,792.08/648.40
  6. Step 6: Final answer
    x = 423.80

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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.