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Finding the Fourth Proportional to 1,142.28, 1,712.39 and 556.92

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Solution

The fourth proportional to 1,142.28, 1,712.39 and 556.92 is: 834.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.28 : 1,712.39 = 556.92 : x
  2. Step 2: Convert to fraction form
    1,142.28/1,712.39 = 556.92/x
  3. Step 3: Cross multiply
    1,142.28x = 1,712.39 × 556.92
  4. Step 4: Simplify right side
    1,142.28x = 953,661.45
  5. Step 5: Solve for x
    x = 953,661.45/1,142.28
  6. Step 6: Final answer
    x = 834.88

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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.