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Finding the Fourth Proportional to 842.70, 1,264.08 and 431.73

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Solution

The fourth proportional to 842.70, 1,264.08 and 431.73 is: 647.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.70 : 1,264.08 = 431.73 : x
  2. Step 2: Convert to fraction form
    842.70/1,264.08 = 431.73/x
  3. Step 3: Cross multiply
    842.70x = 1,264.08 × 431.73
  4. Step 4: Simplify right side
    842.70x = 545,742.88
  5. Step 5: Solve for x
    x = 545,742.88/842.70
  6. Step 6: Final answer
    x = 647.61

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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.