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Finding the Fourth Proportional to 419.29, 578.67 and 320.87

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Solution

The fourth proportional to 419.29, 578.67 and 320.87 is: 442.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.29 : 578.67 = 320.87 : x
  2. Step 2: Convert to fraction form
    419.29/578.67 = 320.87/x
  3. Step 3: Cross multiply
    419.29x = 578.67 × 320.87
  4. Step 4: Simplify right side
    419.29x = 185,677.84
  5. Step 5: Solve for x
    x = 185,677.84/419.29
  6. Step 6: Final answer
    x = 442.84

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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.