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Finding the Fourth Proportional to 951.21, 1,312.74 and 558.54

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Solution

The fourth proportional to 951.21, 1,312.74 and 558.54 is: 770.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.21 : 1,312.74 = 558.54 : x
  2. Step 2: Convert to fraction form
    951.21/1,312.74 = 558.54/x
  3. Step 3: Cross multiply
    951.21x = 1,312.74 × 558.54
  4. Step 4: Simplify right side
    951.21x = 733,217.80
  5. Step 5: Solve for x
    x = 733,217.80/951.21
  6. Step 6: Final answer
    x = 770.83

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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.