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Finding the Fourth Proportional to 1,188.89, 1,783.34 and 780.61

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Solution

The fourth proportional to 1,188.89, 1,783.34 and 780.61 is: 1,170.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.89 : 1,783.34 = 780.61 : x
  2. Step 2: Convert to fraction form
    1,188.89/1,783.34 = 780.61/x
  3. Step 3: Cross multiply
    1,188.89x = 1,783.34 × 780.61
  4. Step 4: Simplify right side
    1,188.89x = 1,392,093.04
  5. Step 5: Solve for x
    x = 1,392,093.04/1,188.89
  6. Step 6: Final answer
    x = 1,170.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.