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Finding the Fourth Proportional to 578.65, 867.99 and 145.81

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Solution

The fourth proportional to 578.65, 867.99 and 145.81 is: 218.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.65 : 867.99 = 145.81 : x
  2. Step 2: Convert to fraction form
    578.65/867.99 = 145.81/x
  3. Step 3: Cross multiply
    578.65x = 867.99 × 145.81
  4. Step 4: Simplify right side
    578.65x = 126,561.62
  5. Step 5: Solve for x
    x = 126,561.62/578.65
  6. Step 6: Final answer
    x = 218.72

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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.