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Finding the Fourth Proportional to 654.12, 902.13 and 405.20

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Solution

The fourth proportional to 654.12, 902.13 and 405.20 is: 558.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.12 : 902.13 = 405.20 : x
  2. Step 2: Convert to fraction form
    654.12/902.13 = 405.20/x
  3. Step 3: Cross multiply
    654.12x = 902.13 × 405.20
  4. Step 4: Simplify right side
    654.12x = 365,538.57
  5. Step 5: Solve for x
    x = 365,538.57/654.12
  6. Step 6: Final answer
    x = 558.82

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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.