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Finding the Fourth Proportional to 1,448.28, 1,998.61 and 785.13

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Solution

The fourth proportional to 1,448.28, 1,998.61 and 785.13 is: 1,083.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,448.28 : 1,998.61 = 785.13 : x
  2. Step 2: Convert to fraction form
    1,448.28/1,998.61 = 785.13/x
  3. Step 3: Cross multiply
    1,448.28x = 1,998.61 × 785.13
  4. Step 4: Simplify right side
    1,448.28x = 1,569,169.65
  5. Step 5: Solve for x
    x = 1,569,169.65/1,448.28
  6. Step 6: Final answer
    x = 1,083.47

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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.