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Finding the Fourth Proportional to 641.52, 882.90 and 612.36

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Solution

The fourth proportional to 641.52, 882.90 and 612.36 is: 842.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.52 : 882.90 = 612.36 : x
  2. Step 2: Convert to fraction form
    641.52/882.90 = 612.36/x
  3. Step 3: Cross multiply
    641.52x = 882.90 × 612.36
  4. Step 4: Simplify right side
    641.52x = 540,652.64
  5. Step 5: Solve for x
    x = 540,652.64/641.52
  6. Step 6: Final answer
    x = 842.77

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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.