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Finding the Fourth Proportional to 558.81, 771.48 and 485.91

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Solution

The fourth proportional to 558.81, 771.48 and 485.91 is: 670.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.81 : 771.48 = 485.91 : x
  2. Step 2: Convert to fraction form
    558.81/771.48 = 485.91/x
  3. Step 3: Cross multiply
    558.81x = 771.48 × 485.91
  4. Step 4: Simplify right side
    558.81x = 374,869.85
  5. Step 5: Solve for x
    x = 374,869.85/558.81
  6. Step 6: Final answer
    x = 670.84

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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.