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Finding the Fourth Proportional to 3,785.79, 5,679.62 and 1,320.63

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Solution

The fourth proportional to 3,785.79, 5,679.62 and 1,320.63 is: 1,981.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,785.79 : 5,679.62 = 1,320.63 : x
  2. Step 2: Convert to fraction form
    3,785.79/5,679.62 = 1,320.63/x
  3. Step 3: Cross multiply
    3,785.79x = 5,679.62 × 1,320.63
  4. Step 4: Simplify right side
    3,785.79x = 7,500,676.56
  5. Step 5: Solve for x
    x = 7,500,676.56/3,785.79
  6. Step 6: Final answer
    x = 1,981.27

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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.