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Finding the Fourth Proportional to 1,186.62, 1,776.90 and 878.02

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Solution

The fourth proportional to 1,186.62, 1,776.90 and 878.02 is: 1,314.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.62 : 1,776.90 = 878.02 : x
  2. Step 2: Convert to fraction form
    1,186.62/1,776.90 = 878.02/x
  3. Step 3: Cross multiply
    1,186.62x = 1,776.90 × 878.02
  4. Step 4: Simplify right side
    1,186.62x = 1,560,153.74
  5. Step 5: Solve for x
    x = 1,560,153.74/1,186.62
  6. Step 6: Final answer
    x = 1,314.79

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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.