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Finding the Fourth Proportional to 1,142.14, 1,713.21 and 276.45

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Solution

The fourth proportional to 1,142.14, 1,713.21 and 276.45 is: 414.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.14 : 1,713.21 = 276.45 : x
  2. Step 2: Convert to fraction form
    1,142.14/1,713.21 = 276.45/x
  3. Step 3: Cross multiply
    1,142.14x = 1,713.21 × 276.45
  4. Step 4: Simplify right side
    1,142.14x = 473,615.52
  5. Step 5: Solve for x
    x = 473,615.52/1,142.14
  6. Step 6: Final answer
    x = 414.68

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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.