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Finding the Fourth Proportional to 866.12, 1,299.19 and 216.86

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Solution

The fourth proportional to 866.12, 1,299.19 and 216.86 is: 325.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.12 : 1,299.19 = 216.86 : x
  2. Step 2: Convert to fraction form
    866.12/1,299.19 = 216.86/x
  3. Step 3: Cross multiply
    866.12x = 1,299.19 × 216.86
  4. Step 4: Simplify right side
    866.12x = 281,742.34
  5. Step 5: Solve for x
    x = 281,742.34/866.12
  6. Step 6: Final answer
    x = 325.29

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1.5x scale

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.