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Finding the Fourth Proportional to 558.66, 770.96 and 309.99

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Solution

The fourth proportional to 558.66, 770.96 and 309.99 is: 427.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.66 : 770.96 = 309.99 : x
  2. Step 2: Convert to fraction form
    558.66/770.96 = 309.99/x
  3. Step 3: Cross multiply
    558.66x = 770.96 × 309.99
  4. Step 4: Simplify right side
    558.66x = 238,990.67
  5. Step 5: Solve for x
    x = 238,990.67/558.66
  6. Step 6: Final answer
    x = 427.79

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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.