Home / 2,107.20-3,159.28-645.56

Finding the Fourth Proportional to 2,107.20, 3,159.28 and 645.56

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Solution

The fourth proportional to 2,107.20, 3,159.28 and 645.56 is: 967.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.20 : 3,159.28 = 645.56 : x
  2. Step 2: Convert to fraction form
    2,107.20/3,159.28 = 645.56/x
  3. Step 3: Cross multiply
    2,107.20x = 3,159.28 × 645.56
  4. Step 4: Simplify right side
    2,107.20x = 2,039,485.77
  5. Step 5: Solve for x
    x = 2,039,485.77/2,107.20
  6. Step 6: Final answer
    x = 967.87

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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.