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Finding the Fourth Proportional to 419.28, 578.56 and 232.72

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Solution

The fourth proportional to 419.28, 578.56 and 232.72 is: 321.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.28 : 578.56 = 232.72 : x
  2. Step 2: Convert to fraction form
    419.28/578.56 = 232.72/x
  3. Step 3: Cross multiply
    419.28x = 578.56 × 232.72
  4. Step 4: Simplify right side
    419.28x = 134,642.48
  5. Step 5: Solve for x
    x = 134,642.48/419.28
  6. Step 6: Final answer
    x = 321.13

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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.