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Finding the Fourth Proportional to 654.20, 902.82 and 392.20

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Solution

The fourth proportional to 654.20, 902.82 and 392.20 is: 541.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.20 : 902.82 = 392.20 : x
  2. Step 2: Convert to fraction form
    654.20/902.82 = 392.20/x
  3. Step 3: Cross multiply
    654.20x = 902.82 × 392.20
  4. Step 4: Simplify right side
    654.20x = 354,086.00
  5. Step 5: Solve for x
    x = 354,086.00/654.20
  6. Step 6: Final answer
    x = 541.25

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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.