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Finding the Fourth Proportional to 3,130.72, 4,321.17 and 1,805.22

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Solution

The fourth proportional to 3,130.72, 4,321.17 and 1,805.22 is: 2,491.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,130.72 : 4,321.17 = 1,805.22 : x
  2. Step 2: Convert to fraction form
    3,130.72/4,321.17 = 1,805.22/x
  3. Step 3: Cross multiply
    3,130.72x = 4,321.17 × 1,805.22
  4. Step 4: Simplify right side
    3,130.72x = 7,800,662.51
  5. Step 5: Solve for x
    x = 7,800,662.51/3,130.72
  6. Step 6: Final answer
    x = 2,491.65

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1.5x scale

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.