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Finding the Fourth Proportional to 1,428.94, 2,143.68 and 455.14

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Solution

The fourth proportional to 1,428.94, 2,143.68 and 455.14 is: 682.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.94 : 2,143.68 = 455.14 : x
  2. Step 2: Convert to fraction form
    1,428.94/2,143.68 = 455.14/x
  3. Step 3: Cross multiply
    1,428.94x = 2,143.68 × 455.14
  4. Step 4: Simplify right side
    1,428.94x = 975,674.52
  5. Step 5: Solve for x
    x = 975,674.52/1,428.94
  6. Step 6: Final answer
    x = 682.80

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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.