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Finding the Fourth Proportional to 650.80, 899.40 and 485.56

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Solution

The fourth proportional to 650.80, 899.40 and 485.56 is: 671.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    650.80 : 899.40 = 485.56 : x
  2. Step 2: Convert to fraction form
    650.80/899.40 = 485.56/x
  3. Step 3: Cross multiply
    650.80x = 899.40 × 485.56
  4. Step 4: Simplify right side
    650.80x = 436,712.66
  5. Step 5: Solve for x
    x = 436,712.66/650.80
  6. Step 6: Final answer
    x = 671.04

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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.