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Finding the Fourth Proportional to 682.80, 1,025.40 and 661.20

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Solution

The fourth proportional to 682.80, 1,025.40 and 661.20 is: 992.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.80 : 1,025.40 = 661.20 : x
  2. Step 2: Convert to fraction form
    682.80/1,025.40 = 661.20/x
  3. Step 3: Cross multiply
    682.80x = 1,025.40 × 661.20
  4. Step 4: Simplify right side
    682.80x = 677,994.48
  5. Step 5: Solve for x
    x = 677,994.48/682.80
  6. Step 6: Final answer
    x = 992.96

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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.