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Finding the Fourth Proportional to 558.12, 770.21 and 309.45

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Solution

The fourth proportional to 558.12, 770.21 and 309.45 is: 427.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.12 : 770.21 = 309.45 : x
  2. Step 2: Convert to fraction form
    558.12/770.21 = 309.45/x
  3. Step 3: Cross multiply
    558.12x = 770.21 × 309.45
  4. Step 4: Simplify right side
    558.12x = 238,339.37
  5. Step 5: Solve for x
    x = 238,339.37/558.12
  6. Step 6: Final answer
    x = 427.04

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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.