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Finding the Fourth Proportional to 558.53, 770.78 and 309.86

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Solution

The fourth proportional to 558.53, 770.78 and 309.86 is: 427.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.53 : 770.78 = 309.86 : x
  2. Step 2: Convert to fraction form
    558.53/770.78 = 309.86/x
  3. Step 3: Cross multiply
    558.53x = 770.78 × 309.86
  4. Step 4: Simplify right side
    558.53x = 238,833.89
  5. Step 5: Solve for x
    x = 238,833.89/558.53
  6. Step 6: Final answer
    x = 427.61

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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.