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Finding the Fourth Proportional to 860.53, 1,288.86 and 664.16

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Solution

The fourth proportional to 860.53, 1,288.86 and 664.16 is: 994.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.53 : 1,288.86 = 664.16 : x
  2. Step 2: Convert to fraction form
    860.53/1,288.86 = 664.16/x
  3. Step 3: Cross multiply
    860.53x = 1,288.86 × 664.16
  4. Step 4: Simplify right side
    860.53x = 856,007.68
  5. Step 5: Solve for x
    x = 856,007.68/860.53
  6. Step 6: Final answer
    x = 994.74

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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.