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Finding the Fourth Proportional to 1,274.13, 1,911.27 and 812.80

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Solution

The fourth proportional to 1,274.13, 1,911.27 and 812.80 is: 1,219.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.13 : 1,911.27 = 812.80 : x
  2. Step 2: Convert to fraction form
    1,274.13/1,911.27 = 812.80/x
  3. Step 3: Cross multiply
    1,274.13x = 1,911.27 × 812.80
  4. Step 4: Simplify right side
    1,274.13x = 1,553,480.26
  5. Step 5: Solve for x
    x = 1,553,480.26/1,274.13
  6. Step 6: Final answer
    x = 1,219.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.