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Finding the Fourth Proportional to 484.71, 668.79 and 285.48

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Solution

The fourth proportional to 484.71, 668.79 and 285.48 is: 393.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.71 : 668.79 = 285.48 : x
  2. Step 2: Convert to fraction form
    484.71/668.79 = 285.48/x
  3. Step 3: Cross multiply
    484.71x = 668.79 × 285.48
  4. Step 4: Simplify right side
    484.71x = 190,926.17
  5. Step 5: Solve for x
    x = 190,926.17/484.71
  6. Step 6: Final answer
    x = 393.90

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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.