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Finding the Fourth Proportional to 842.36, 1,263.26 and 431.72

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Solution

The fourth proportional to 842.36, 1,263.26 and 431.72 is: 647.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.36 : 1,263.26 = 431.72 : x
  2. Step 2: Convert to fraction form
    842.36/1,263.26 = 431.72/x
  3. Step 3: Cross multiply
    842.36x = 1,263.26 × 431.72
  4. Step 4: Simplify right side
    842.36x = 545,374.61
  5. Step 5: Solve for x
    x = 545,374.61/842.36
  6. Step 6: Final answer
    x = 647.44

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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.