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Finding the Fourth Proportional to 1,125.93, 1,689.70 and 396.12

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Solution

The fourth proportional to 1,125.93, 1,689.70 and 396.12 is: 594.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.93 : 1,689.70 = 396.12 : x
  2. Step 2: Convert to fraction form
    1,125.93/1,689.70 = 396.12/x
  3. Step 3: Cross multiply
    1,125.93x = 1,689.70 × 396.12
  4. Step 4: Simplify right side
    1,125.93x = 669,314.53
  5. Step 5: Solve for x
    x = 669,314.53/1,125.93
  6. Step 6: Final answer
    x = 594.46

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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.