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Finding the Fourth Proportional to 419.96, 578.87 and 288.74

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Solution

The fourth proportional to 419.96, 578.87 and 288.74 is: 397.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.96 : 578.87 = 288.74 : x
  2. Step 2: Convert to fraction form
    419.96/578.87 = 288.74/x
  3. Step 3: Cross multiply
    419.96x = 578.87 × 288.74
  4. Step 4: Simplify right side
    419.96x = 167,138.59
  5. Step 5: Solve for x
    x = 167,138.59/419.96
  6. Step 6: Final answer
    x = 397.99

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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.