Home / 3,139.20-4,708.46-947.42

Finding the Fourth Proportional to 3,139.20, 4,708.46 and 947.42

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Solution

The fourth proportional to 3,139.20, 4,708.46 and 947.42 is: 1,421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.20 : 4,708.46 = 947.42 : x
  2. Step 2: Convert to fraction form
    3,139.20/4,708.46 = 947.42/x
  3. Step 3: Cross multiply
    3,139.20x = 4,708.46 × 947.42
  4. Step 4: Simplify right side
    3,139.20x = 4,460,889.17
  5. Step 5: Solve for x
    x = 4,460,889.17/3,139.20
  6. Step 6: Final answer
    x = 1,421.03

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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.