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Finding the Fourth Proportional to 1,145.80, 1,581.19 and 648.43

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Solution

The fourth proportional to 1,145.80, 1,581.19 and 648.43 is: 894.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.80 : 1,581.19 = 648.43 : x
  2. Step 2: Convert to fraction form
    1,145.80/1,581.19 = 648.43/x
  3. Step 3: Cross multiply
    1,145.80x = 1,581.19 × 648.43
  4. Step 4: Simplify right side
    1,145.80x = 1,025,291.03
  5. Step 5: Solve for x
    x = 1,025,291.03/1,145.80
  6. Step 6: Final answer
    x = 894.83

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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.