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Finding the Fourth Proportional to 682.96, 948.04 and 639.76

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Solution

The fourth proportional to 682.96, 948.04 and 639.76 is: 888.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.96 : 948.04 = 639.76 : x
  2. Step 2: Convert to fraction form
    682.96/948.04 = 639.76/x
  3. Step 3: Cross multiply
    682.96x = 948.04 × 639.76
  4. Step 4: Simplify right side
    682.96x = 606,518.07
  5. Step 5: Solve for x
    x = 606,518.07/682.96
  6. Step 6: Final answer
    x = 888.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.