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Finding the Fourth Proportional to 558.30, 770.47 and 309.67

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Solution

The fourth proportional to 558.30, 770.47 and 309.67 is: 427.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.30 : 770.47 = 309.67 : x
  2. Step 2: Convert to fraction form
    558.30/770.47 = 309.67/x
  3. Step 3: Cross multiply
    558.30x = 770.47 × 309.67
  4. Step 4: Simplify right side
    558.30x = 238,591.44
  5. Step 5: Solve for x
    x = 238,591.44/558.30
  6. Step 6: Final answer
    x = 427.35

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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.