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Finding the Fourth Proportional to 1,429.75, 2,144.80 and 505.12

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Solution

The fourth proportional to 1,429.75, 2,144.80 and 505.12 is: 757.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.75 : 2,144.80 = 505.12 : x
  2. Step 2: Convert to fraction form
    1,429.75/2,144.80 = 505.12/x
  3. Step 3: Cross multiply
    1,429.75x = 2,144.80 × 505.12
  4. Step 4: Simplify right side
    1,429.75x = 1,083,381.38
  5. Step 5: Solve for x
    x = 1,083,381.38/1,429.75
  6. Step 6: Final answer
    x = 757.74

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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.