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Finding the Fourth Proportional to 1,179.11, 1,627.45 and 780.86

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Solution

The fourth proportional to 1,179.11, 1,627.45 and 780.86 is: 1,077.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.11 : 1,627.45 = 780.86 : x
  2. Step 2: Convert to fraction form
    1,179.11/1,627.45 = 780.86/x
  3. Step 3: Cross multiply
    1,179.11x = 1,627.45 × 780.86
  4. Step 4: Simplify right side
    1,179.11x = 1,270,812.72
  5. Step 5: Solve for x
    x = 1,270,812.72/1,179.11
  6. Step 6: Final answer
    x = 1,077.77

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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.