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Finding the Fourth Proportional to 937, 1,291.60 and 641.80

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Solution

The fourth proportional to 937, 1,291.60 and 641.80 is: 884.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    937 : 1,291.60 = 641.80 : x
  2. Step 2: Convert to fraction form
    937/1,291.60 = 641.80/x
  3. Step 3: Cross multiply
    937x = 1,291.60 × 641.80
  4. Step 4: Simplify right side
    937x = 828,948.88
  5. Step 5: Solve for x
    x = 828,948.88/937
  6. Step 6: Final answer
    x = 884.68

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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.