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Finding the Fourth Proportional to 2,790.55, 4,186.55 and 1,230.90

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Solution

The fourth proportional to 2,790.55, 4,186.55 and 1,230.90 is: 1,846.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,790.55 : 4,186.55 = 1,230.90 : x
  2. Step 2: Convert to fraction form
    2,790.55/4,186.55 = 1,230.90/x
  3. Step 3: Cross multiply
    2,790.55x = 4,186.55 × 1,230.90
  4. Step 4: Simplify right side
    2,790.55x = 5,153,211.77
  5. Step 5: Solve for x
    x = 5,153,211.77/2,790.55
  6. Step 6: Final answer
    x = 1,846.66

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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.