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Finding the Fourth Proportional to 1,126.61, 1,689.45 and 396.01

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Solution

The fourth proportional to 1,126.61, 1,689.45 and 396.01 is: 593.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.61 : 1,689.45 = 396.01 : x
  2. Step 2: Convert to fraction form
    1,126.61/1,689.45 = 396.01/x
  3. Step 3: Cross multiply
    1,126.61x = 1,689.45 × 396.01
  4. Step 4: Simplify right side
    1,126.61x = 669,039.09
  5. Step 5: Solve for x
    x = 669,039.09/1,126.61
  6. Step 6: Final answer
    x = 593.85

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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.