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Finding the Fourth Proportional to 1,428.99, 2,143.02 and 454.86

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Solution

The fourth proportional to 1,428.99, 2,143.02 and 454.86 is: 682.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.99 : 2,143.02 = 454.86 : x
  2. Step 2: Convert to fraction form
    1,428.99/2,143.02 = 454.86/x
  3. Step 3: Cross multiply
    1,428.99x = 2,143.02 × 454.86
  4. Step 4: Simplify right side
    1,428.99x = 974,775.78
  5. Step 5: Solve for x
    x = 974,775.78/1,428.99
  6. Step 6: Final answer
    x = 682.14

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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.