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Finding the Fourth Proportional to 1,142.70, 1,713.69 and 448.86

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Solution

The fourth proportional to 1,142.70, 1,713.69 and 448.86 is: 673.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.70 : 1,713.69 = 448.86 : x
  2. Step 2: Convert to fraction form
    1,142.70/1,713.69 = 448.86/x
  3. Step 3: Cross multiply
    1,142.70x = 1,713.69 × 448.86
  4. Step 4: Simplify right side
    1,142.70x = 769,206.89
  5. Step 5: Solve for x
    x = 769,206.89/1,142.70
  6. Step 6: Final answer
    x = 673.15

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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.