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Finding the Fourth Proportional to 1,421.87, 2,132.21 and 837

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Solution

The fourth proportional to 1,421.87, 2,132.21 and 837 is: 1,255.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.87 : 2,132.21 = 837 : x
  2. Step 2: Convert to fraction form
    1,421.87/2,132.21 = 837/x
  3. Step 3: Cross multiply
    1,421.87x = 2,132.21 × 837
  4. Step 4: Simplify right side
    1,421.87x = 1,784,661.86
  5. Step 5: Solve for x
    x = 1,784,661.86/1,421.87
  6. Step 6: Final answer
    x = 1,255.16

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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.