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Finding the Fourth Proportional to 419.13, 578.25 and 261.65

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Solution

The fourth proportional to 419.13, 578.25 and 261.65 is: 360.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.13 : 578.25 = 261.65 : x
  2. Step 2: Convert to fraction form
    419.13/578.25 = 261.65/x
  3. Step 3: Cross multiply
    419.13x = 578.25 × 261.65
  4. Step 4: Simplify right side
    419.13x = 151,300.56
  5. Step 5: Solve for x
    x = 151,300.56/419.13
  6. Step 6: Final answer
    x = 360.99

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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.