Home / 1,415.38-2,121.66-673.69

Finding the Fourth Proportional to 1,415.38, 2,121.66 and 673.69

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Solution

The fourth proportional to 1,415.38, 2,121.66 and 673.69 is: 1,009.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.38 : 2,121.66 = 673.69 : x
  2. Step 2: Convert to fraction form
    1,415.38/2,121.66 = 673.69/x
  3. Step 3: Cross multiply
    1,415.38x = 2,121.66 × 673.69
  4. Step 4: Simplify right side
    1,415.38x = 1,429,341.13
  5. Step 5: Solve for x
    x = 1,429,341.13/1,415.38
  6. Step 6: Final answer
    x = 1,009.86

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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.