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Finding the Fourth Proportional to 2,738.86, 4,108.90 and 790.90

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Solution

The fourth proportional to 2,738.86, 4,108.90 and 790.90 is: 1,186.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,738.86 : 4,108.90 = 790.90 : x
  2. Step 2: Convert to fraction form
    2,738.86/4,108.90 = 790.90/x
  3. Step 3: Cross multiply
    2,738.86x = 4,108.90 × 790.90
  4. Step 4: Simplify right side
    2,738.86x = 3,249,729.01
  5. Step 5: Solve for x
    x = 3,249,729.01/2,738.86
  6. Step 6: Final answer
    x = 1,186.53

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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.