Home / 1,412.93-2,120.70-720.09

Finding the Fourth Proportional to 1,412.93, 2,120.70 and 720.09

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Solution

The fourth proportional to 1,412.93, 2,120.70 and 720.09 is: 1,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.93 : 2,120.70 = 720.09 : x
  2. Step 2: Convert to fraction form
    1,412.93/2,120.70 = 720.09/x
  3. Step 3: Cross multiply
    1,412.93x = 2,120.70 × 720.09
  4. Step 4: Simplify right side
    1,412.93x = 1,527,094.86
  5. Step 5: Solve for x
    x = 1,527,094.86/1,412.93
  6. Step 6: Final answer
    x = 1,080.80

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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.