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Finding the Fourth Proportional to 1,143.42, 1,579.35 and 933.90

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Solution

The fourth proportional to 1,143.42, 1,579.35 and 933.90 is: 1,289.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.42 : 1,579.35 = 933.90 : x
  2. Step 2: Convert to fraction form
    1,143.42/1,579.35 = 933.90/x
  3. Step 3: Cross multiply
    1,143.42x = 1,579.35 × 933.90
  4. Step 4: Simplify right side
    1,143.42x = 1,474,954.97
  5. Step 5: Solve for x
    x = 1,474,954.97/1,143.42
  6. Step 6: Final answer
    x = 1,289.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.