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Finding the Fourth Proportional to 1,429.84, 2,144.21 and 505.15

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Solution

The fourth proportional to 1,429.84, 2,144.21 and 505.15 is: 757.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.84 : 2,144.21 = 505.15 : x
  2. Step 2: Convert to fraction form
    1,429.84/2,144.21 = 505.15/x
  3. Step 3: Cross multiply
    1,429.84x = 2,144.21 × 505.15
  4. Step 4: Simplify right side
    1,429.84x = 1,083,136.96
  5. Step 5: Solve for x
    x = 1,083,136.96/1,429.84
  6. Step 6: Final answer
    x = 757.53

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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.