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Finding the Fourth Proportional to 1,429.86, 2,143.08 and 813.90

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Solution

The fourth proportional to 1,429.86, 2,143.08 and 813.90 is: 1,219.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.86 : 2,143.08 = 813.90 : x
  2. Step 2: Convert to fraction form
    1,429.86/2,143.08 = 813.90/x
  3. Step 3: Cross multiply
    1,429.86x = 2,143.08 × 813.90
  4. Step 4: Simplify right side
    1,429.86x = 1,744,252.81
  5. Step 5: Solve for x
    x = 1,744,252.81/1,429.86
  6. Step 6: Final answer
    x = 1,219.88

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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.