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Finding the Fourth Proportional to 851.54, 1,276.78 and 558.68

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Solution

The fourth proportional to 851.54, 1,276.78 and 558.68 is: 837.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.54 : 1,276.78 = 558.68 : x
  2. Step 2: Convert to fraction form
    851.54/1,276.78 = 558.68/x
  3. Step 3: Cross multiply
    851.54x = 1,276.78 × 558.68
  4. Step 4: Simplify right side
    851.54x = 713,311.45
  5. Step 5: Solve for x
    x = 713,311.45/851.54
  6. Step 6: Final answer
    x = 837.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.