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Finding the Fourth Proportional to 1,429.56, 2,143.67 and 455.40

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Solution

The fourth proportional to 1,429.56, 2,143.67 and 455.40 is: 682.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.56 : 2,143.67 = 455.40 : x
  2. Step 2: Convert to fraction form
    1,429.56/2,143.67 = 455.40/x
  3. Step 3: Cross multiply
    1,429.56x = 2,143.67 × 455.40
  4. Step 4: Simplify right side
    1,429.56x = 976,225.04
  5. Step 5: Solve for x
    x = 976,225.04/1,429.56
  6. Step 6: Final answer
    x = 682.88

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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.