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Finding the Fourth Proportional to 1,284.32, 1,772.36 and 694.86

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Solution

The fourth proportional to 1,284.32, 1,772.36 and 694.86 is: 958.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.32 : 1,772.36 = 694.86 : x
  2. Step 2: Convert to fraction form
    1,284.32/1,772.36 = 694.86/x
  3. Step 3: Cross multiply
    1,284.32x = 1,772.36 × 694.86
  4. Step 4: Simplify right side
    1,284.32x = 1,231,542.07
  5. Step 5: Solve for x
    x = 1,231,542.07/1,284.32
  6. Step 6: Final answer
    x = 958.91

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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.