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Finding the Fourth Proportional to 419.50, 578.75 and 309.24

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Solution

The fourth proportional to 419.50, 578.75 and 309.24 is: 426.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.50 : 578.75 = 309.24 : x
  2. Step 2: Convert to fraction form
    419.50/578.75 = 309.24/x
  3. Step 3: Cross multiply
    419.50x = 578.75 × 309.24
  4. Step 4: Simplify right side
    419.50x = 178,968.21
  5. Step 5: Solve for x
    x = 178,968.21/419.50
  6. Step 6: Final answer
    x = 426.63

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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.