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Finding the Fourth Proportional to 289.63, 399.71 and 158.65

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Solution

The fourth proportional to 289.63, 399.71 and 158.65 is: 218.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.63 : 399.71 = 158.65 : x
  2. Step 2: Convert to fraction form
    289.63/399.71 = 158.65/x
  3. Step 3: Cross multiply
    289.63x = 399.71 × 158.65
  4. Step 4: Simplify right side
    289.63x = 63,413.99
  5. Step 5: Solve for x
    x = 63,413.99/289.63
  6. Step 6: Final answer
    x = 218.95

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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.