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Finding the Fourth Proportional to 682.86, 1,023.06 and 646.40

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Solution

The fourth proportional to 682.86, 1,023.06 and 646.40 is: 968.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.86 : 1,023.06 = 646.40 : x
  2. Step 2: Convert to fraction form
    682.86/1,023.06 = 646.40/x
  3. Step 3: Cross multiply
    682.86x = 1,023.06 × 646.40
  4. Step 4: Simplify right side
    682.86x = 661,305.98
  5. Step 5: Solve for x
    x = 661,305.98/682.86
  6. Step 6: Final answer
    x = 968.44

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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.