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Finding the Fourth Proportional to 684.39, 1,027.28 and 606.80

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Solution

The fourth proportional to 684.39, 1,027.28 and 606.80 is: 910.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.39 : 1,027.28 = 606.80 : x
  2. Step 2: Convert to fraction form
    684.39/1,027.28 = 606.80/x
  3. Step 3: Cross multiply
    684.39x = 1,027.28 × 606.80
  4. Step 4: Simplify right side
    684.39x = 623,357.59
  5. Step 5: Solve for x
    x = 623,357.59/684.39
  6. Step 6: Final answer
    x = 910.82

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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.