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Finding the Fourth Proportional to 418.02, 575.58 and 286.80

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Solution

The fourth proportional to 418.02, 575.58 and 286.80 is: 394.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.02 : 575.58 = 286.80 : x
  2. Step 2: Convert to fraction form
    418.02/575.58 = 286.80/x
  3. Step 3: Cross multiply
    418.02x = 575.58 × 286.80
  4. Step 4: Simplify right side
    418.02x = 165,076.34
  5. Step 5: Solve for x
    x = 165,076.34/418.02
  6. Step 6: Final answer
    x = 394.90

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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.