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Finding the Fourth Proportional to 558.50, 770.23 and 399.53

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Solution

The fourth proportional to 558.50, 770.23 and 399.53 is: 550.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.50 : 770.23 = 399.53 : x
  2. Step 2: Convert to fraction form
    558.50/770.23 = 399.53/x
  3. Step 3: Cross multiply
    558.50x = 770.23 × 399.53
  4. Step 4: Simplify right side
    558.50x = 307,725.14
  5. Step 5: Solve for x
    x = 307,725.14/558.50
  6. Step 6: Final answer
    x = 550.99

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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.