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Finding the Fourth Proportional to 1,079.94, 1,489.61 and 637.48

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Solution

The fourth proportional to 1,079.94, 1,489.61 and 637.48 is: 879.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.94 : 1,489.61 = 637.48 : x
  2. Step 2: Convert to fraction form
    1,079.94/1,489.61 = 637.48/x
  3. Step 3: Cross multiply
    1,079.94x = 1,489.61 × 637.48
  4. Step 4: Simplify right side
    1,079.94x = 949,594.45
  5. Step 5: Solve for x
    x = 949,594.45/1,079.94
  6. Step 6: Final answer
    x = 879.30

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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.