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Finding the Fourth Proportional to 1,260.12, 1,739.75 and 812.15

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Solution

The fourth proportional to 1,260.12, 1,739.75 and 812.15 is: 1,121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.12 : 1,739.75 = 812.15 : x
  2. Step 2: Convert to fraction form
    1,260.12/1,739.75 = 812.15/x
  3. Step 3: Cross multiply
    1,260.12x = 1,739.75 × 812.15
  4. Step 4: Simplify right side
    1,260.12x = 1,412,933.90
  5. Step 5: Solve for x
    x = 1,412,933.90/1,260.12
  6. Step 6: Final answer
    x = 1,121.27

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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.