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Finding the Fourth Proportional to 289.64, 399.68 and 158.64

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Solution

The fourth proportional to 289.64, 399.68 and 158.64 is: 218.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.64 : 399.68 = 158.64 : x
  2. Step 2: Convert to fraction form
    289.64/399.68 = 158.64/x
  3. Step 3: Cross multiply
    289.64x = 399.68 × 158.64
  4. Step 4: Simplify right side
    289.64x = 63,406.68
  5. Step 5: Solve for x
    x = 63,406.68/289.64
  6. Step 6: Final answer
    x = 218.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.