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Finding the Fourth Proportional to 418.35, 577.14 and 285.42

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Solution

The fourth proportional to 418.35, 577.14 and 285.42 is: 393.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.35 : 577.14 = 285.42 : x
  2. Step 2: Convert to fraction form
    418.35/577.14 = 285.42/x
  3. Step 3: Cross multiply
    418.35x = 577.14 × 285.42
  4. Step 4: Simplify right side
    418.35x = 164,727.30
  5. Step 5: Solve for x
    x = 164,727.30/418.35
  6. Step 6: Final answer
    x = 393.75

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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.