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Finding the Fourth Proportional to 1,126.46, 1,689.70 and 395.87

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Solution

The fourth proportional to 1,126.46, 1,689.70 and 395.87 is: 593.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.46 : 1,689.70 = 395.87 : x
  2. Step 2: Convert to fraction form
    1,126.46/1,689.70 = 395.87/x
  3. Step 3: Cross multiply
    1,126.46x = 1,689.70 × 395.87
  4. Step 4: Simplify right side
    1,126.46x = 668,901.54
  5. Step 5: Solve for x
    x = 668,901.54/1,126.46
  6. Step 6: Final answer
    x = 593.81

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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.