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Finding the Fourth Proportional to 1,428.61, 2,143.09 and 504.40

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Solution

The fourth proportional to 1,428.61, 2,143.09 and 504.40 is: 756.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.61 : 2,143.09 = 504.40 : x
  2. Step 2: Convert to fraction form
    1,428.61/2,143.09 = 504.40/x
  3. Step 3: Cross multiply
    1,428.61x = 2,143.09 × 504.40
  4. Step 4: Simplify right side
    1,428.61x = 1,080,974.60
  5. Step 5: Solve for x
    x = 1,080,974.60/1,428.61
  6. Step 6: Final answer
    x = 756.66

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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.