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Finding the Fourth Proportional to 419.98, 579.33 and 288.76

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Solution

The fourth proportional to 419.98, 579.33 and 288.76 is: 398.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.98 : 579.33 = 288.76 : x
  2. Step 2: Convert to fraction form
    419.98/579.33 = 288.76/x
  3. Step 3: Cross multiply
    419.98x = 579.33 × 288.76
  4. Step 4: Simplify right side
    419.98x = 167,287.33
  5. Step 5: Solve for x
    x = 167,287.33/419.98
  6. Step 6: Final answer
    x = 398.32

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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.