Home / 1,340.10-2,008.80-645.75

Finding the Fourth Proportional to 1,340.10, 2,008.80 and 645.75

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Solution

The fourth proportional to 1,340.10, 2,008.80 and 645.75 is: 967.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.10 : 2,008.80 = 645.75 : x
  2. Step 2: Convert to fraction form
    1,340.10/2,008.80 = 645.75/x
  3. Step 3: Cross multiply
    1,340.10x = 2,008.80 × 645.75
  4. Step 4: Simplify right side
    1,340.10x = 1,297,182.60
  5. Step 5: Solve for x
    x = 1,297,182.60/1,340.10
  6. Step 6: Final answer
    x = 967.97

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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.