Home / 3,139.40-4,707.68-1,678.24

Finding the Fourth Proportional to 3,139.40, 4,707.68 and 1,678.24

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Solution

The fourth proportional to 3,139.40, 4,707.68 and 1,678.24 is: 2,516.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.40 : 4,707.68 = 1,678.24 : x
  2. Step 2: Convert to fraction form
    3,139.40/4,707.68 = 1,678.24/x
  3. Step 3: Cross multiply
    3,139.40x = 4,707.68 × 1,678.24
  4. Step 4: Simplify right side
    3,139.40x = 7,900,616.88
  5. Step 5: Solve for x
    x = 7,900,616.88/3,139.40
  6. Step 6: Final answer
    x = 2,516.60

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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.