Home / 3,139.10-4,708.68-947.85

Finding the Fourth Proportional to 3,139.10, 4,708.68 and 947.85

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Solution

The fourth proportional to 3,139.10, 4,708.68 and 947.85 is: 1,421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.10 : 4,708.68 = 947.85 : x
  2. Step 2: Convert to fraction form
    3,139.10/4,708.68 = 947.85/x
  3. Step 3: Cross multiply
    3,139.10x = 4,708.68 × 947.85
  4. Step 4: Simplify right side
    3,139.10x = 4,463,122.34
  5. Step 5: Solve for x
    x = 4,463,122.34/3,139.10
  6. Step 6: Final answer
    x = 1,421.78

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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.