Home / 1,207.20-1,662.40-1,074.72

Finding the Fourth Proportional to 1,207.20, 1,662.40 and 1,074.72

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Solution

The fourth proportional to 1,207.20, 1,662.40 and 1,074.72 is: 1,479.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.20 : 1,662.40 = 1,074.72 : x
  2. Step 2: Convert to fraction form
    1,207.20/1,662.40 = 1,074.72/x
  3. Step 3: Cross multiply
    1,207.20x = 1,662.40 × 1,074.72
  4. Step 4: Simplify right side
    1,207.20x = 1,786,614.53
  5. Step 5: Solve for x
    x = 1,786,614.53/1,207.20
  6. Step 6: Final answer
    x = 1,479.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.