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Finding the Fourth Proportional to 1,284.33, 1,772.35 and 694.86

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Solution

The fourth proportional to 1,284.33, 1,772.35 and 694.86 is: 958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.33 : 1,772.35 = 694.86 : x
  2. Step 2: Convert to fraction form
    1,284.33/1,772.35 = 694.86/x
  3. Step 3: Cross multiply
    1,284.33x = 1,772.35 × 694.86
  4. Step 4: Simplify right side
    1,284.33x = 1,231,535.12
  5. Step 5: Solve for x
    x = 1,231,535.12/1,284.33
  6. Step 6: Final answer
    x = 958.89

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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.