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Finding the Fourth Proportional to 419.58, 578.72 and 321.17

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Solution

The fourth proportional to 419.58, 578.72 and 321.17 is: 442.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.58 : 578.72 = 321.17 : x
  2. Step 2: Convert to fraction form
    419.58/578.72 = 321.17/x
  3. Step 3: Cross multiply
    419.58x = 578.72 × 321.17
  4. Step 4: Simplify right side
    419.58x = 185,865.41
  5. Step 5: Solve for x
    x = 185,865.41/419.58
  6. Step 6: Final answer
    x = 442.98

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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.