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Finding the Fourth Proportional to 1,188.28, 1,640.48 and 873.28

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Solution

The fourth proportional to 1,188.28, 1,640.48 and 873.28 is: 1,205.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.28 : 1,640.48 = 873.28 : x
  2. Step 2: Convert to fraction form
    1,188.28/1,640.48 = 873.28/x
  3. Step 3: Cross multiply
    1,188.28x = 1,640.48 × 873.28
  4. Step 4: Simplify right side
    1,188.28x = 1,432,598.37
  5. Step 5: Solve for x
    x = 1,432,598.37/1,188.28
  6. Step 6: Final answer
    x = 1,205.61

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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.