Home / 1,428.30-2,142.36-455.10

Finding the Fourth Proportional to 1,428.30, 2,142.36 and 455.10

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Solution

The fourth proportional to 1,428.30, 2,142.36 and 455.10 is: 682.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.30 : 2,142.36 = 455.10 : x
  2. Step 2: Convert to fraction form
    1,428.30/2,142.36 = 455.10/x
  3. Step 3: Cross multiply
    1,428.30x = 2,142.36 × 455.10
  4. Step 4: Simplify right side
    1,428.30x = 974,988.04
  5. Step 5: Solve for x
    x = 974,988.04/1,428.30
  6. Step 6: Final answer
    x = 682.62

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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.