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Finding the Fourth Proportional to 684.73, 1,025.55 and 661.66

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Solution

The fourth proportional to 684.73, 1,025.55 and 661.66 is: 991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.73 : 1,025.55 = 661.66 : x
  2. Step 2: Convert to fraction form
    684.73/1,025.55 = 661.66/x
  3. Step 3: Cross multiply
    684.73x = 1,025.55 × 661.66
  4. Step 4: Simplify right side
    684.73x = 678,571.15
  5. Step 5: Solve for x
    x = 678,571.15/684.73
  6. Step 6: Final answer
    x = 991.01

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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.