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Finding the Fourth Proportional to 289.65, 399.69 and 158.66

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Solution

The fourth proportional to 289.65, 399.69 and 158.66 is: 218.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.65 : 399.69 = 158.66 : x
  2. Step 2: Convert to fraction form
    289.65/399.69 = 158.66/x
  3. Step 3: Cross multiply
    289.65x = 399.69 × 158.66
  4. Step 4: Simplify right side
    289.65x = 63,412.82
  5. Step 5: Solve for x
    x = 63,412.82/289.65
  6. Step 6: Final answer
    x = 218.93

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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.