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Finding the Fourth Proportional to 2,991.65, 4,128.81 and 1,732.69

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Solution

The fourth proportional to 2,991.65, 4,128.81 and 1,732.69 is: 2,391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.65 : 4,128.81 = 1,732.69 : x
  2. Step 2: Convert to fraction form
    2,991.65/4,128.81 = 1,732.69/x
  3. Step 3: Cross multiply
    2,991.65x = 4,128.81 × 1,732.69
  4. Step 4: Simplify right side
    2,991.65x = 7,153,918.49
  5. Step 5: Solve for x
    x = 7,153,918.49/2,991.65
  6. Step 6: Final answer
    x = 2,391.30

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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.