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Finding the Fourth Proportional to 1,428.79, 2,143.85 and 505.04

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Solution

The fourth proportional to 1,428.79, 2,143.85 and 505.04 is: 757.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.79 : 2,143.85 = 505.04 : x
  2. Step 2: Convert to fraction form
    1,428.79/2,143.85 = 505.04/x
  3. Step 3: Cross multiply
    1,428.79x = 2,143.85 × 505.04
  4. Step 4: Simplify right side
    1,428.79x = 1,082,727.48
  5. Step 5: Solve for x
    x = 1,082,727.48/1,428.79
  6. Step 6: Final answer
    x = 757.80

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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.