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Finding the Fourth Proportional to 1,289.92, 1,783.02 and 1,187.86

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Solution

The fourth proportional to 1,289.92, 1,783.02 and 1,187.86 is: 1,641.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.92 : 1,783.02 = 1,187.86 : x
  2. Step 2: Convert to fraction form
    1,289.92/1,783.02 = 1,187.86/x
  3. Step 3: Cross multiply
    1,289.92x = 1,783.02 × 1,187.86
  4. Step 4: Simplify right side
    1,289.92x = 2,117,978.14
  5. Step 5: Solve for x
    x = 2,117,978.14/1,289.92
  6. Step 6: Final answer
    x = 1,641.95

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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.