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Finding the Fourth Proportional to 684.68, 1,027.74 and 669.20

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Solution

The fourth proportional to 684.68, 1,027.74 and 669.20 is: 1,004.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.68 : 1,027.74 = 669.20 : x
  2. Step 2: Convert to fraction form
    684.68/1,027.74 = 669.20/x
  3. Step 3: Cross multiply
    684.68x = 1,027.74 × 669.20
  4. Step 4: Simplify right side
    684.68x = 687,763.61
  5. Step 5: Solve for x
    x = 687,763.61/684.68
  6. Step 6: Final answer
    x = 1,004.50

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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.