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Finding the Fourth Proportional to 860.96, 1,289.38 and 494.64

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Solution

The fourth proportional to 860.96, 1,289.38 and 494.64 is: 740.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.96 : 1,289.38 = 494.64 : x
  2. Step 2: Convert to fraction form
    860.96/1,289.38 = 494.64/x
  3. Step 3: Cross multiply
    860.96x = 1,289.38 × 494.64
  4. Step 4: Simplify right side
    860.96x = 637,778.92
  5. Step 5: Solve for x
    x = 637,778.92/860.96
  6. Step 6: Final answer
    x = 740.78

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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.