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Finding the Fourth Proportional to 1,291.86, 1,939.95 and 1,281.78

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Solution

The fourth proportional to 1,291.86, 1,939.95 and 1,281.78 is: 1,924.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.86 : 1,939.95 = 1,281.78 : x
  2. Step 2: Convert to fraction form
    1,291.86/1,939.95 = 1,281.78/x
  3. Step 3: Cross multiply
    1,291.86x = 1,939.95 × 1,281.78
  4. Step 4: Simplify right side
    1,291.86x = 2,486,589.11
  5. Step 5: Solve for x
    x = 2,486,589.11/1,291.86
  6. Step 6: Final answer
    x = 1,924.81

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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.