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Finding the Fourth Proportional to 1,188.27, 1,639.87 and 657.15

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Solution

The fourth proportional to 1,188.27, 1,639.87 and 657.15 is: 906.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.27 : 1,639.87 = 657.15 : x
  2. Step 2: Convert to fraction form
    1,188.27/1,639.87 = 657.15/x
  3. Step 3: Cross multiply
    1,188.27x = 1,639.87 × 657.15
  4. Step 4: Simplify right side
    1,188.27x = 1,077,641.54
  5. Step 5: Solve for x
    x = 1,077,641.54/1,188.27
  6. Step 6: Final answer
    x = 906.90

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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.