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Finding the Fourth Proportional to 1,421.94, 2,131.64 and 496.86

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Solution

The fourth proportional to 1,421.94, 2,131.64 and 496.86 is: 744.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.94 : 2,131.64 = 496.86 : x
  2. Step 2: Convert to fraction form
    1,421.94/2,131.64 = 496.86/x
  3. Step 3: Cross multiply
    1,421.94x = 2,131.64 × 496.86
  4. Step 4: Simplify right side
    1,421.94x = 1,059,126.65
  5. Step 5: Solve for x
    x = 1,059,126.65/1,421.94
  6. Step 6: Final answer
    x = 744.85

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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.