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Finding the Fourth Proportional to 2,639.72, 3,959.59 and 790.85

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Solution

The fourth proportional to 2,639.72, 3,959.59 and 790.85 is: 1,186.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.72 : 3,959.59 = 790.85 : x
  2. Step 2: Convert to fraction form
    2,639.72/3,959.59 = 790.85/x
  3. Step 3: Cross multiply
    2,639.72x = 3,959.59 × 790.85
  4. Step 4: Simplify right side
    2,639.72x = 3,131,421.95
  5. Step 5: Solve for x
    x = 3,131,421.95/2,639.72
  6. Step 6: Final answer
    x = 1,186.27

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1.5x scale

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.