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Finding the Fourth Proportional to 1,285.84, 1,772.12 and 935.92

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Solution

The fourth proportional to 1,285.84, 1,772.12 and 935.92 is: 1,289.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.84 : 1,772.12 = 935.92 : x
  2. Step 2: Convert to fraction form
    1,285.84/1,772.12 = 935.92/x
  3. Step 3: Cross multiply
    1,285.84x = 1,772.12 × 935.92
  4. Step 4: Simplify right side
    1,285.84x = 1,658,562.55
  5. Step 5: Solve for x
    x = 1,658,562.55/1,285.84
  6. Step 6: Final answer
    x = 1,289.87

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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.