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Finding the Fourth Proportional to 1,270.80, 1,906.20 and 833.40

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Solution

The fourth proportional to 1,270.80, 1,906.20 and 833.40 is: 1,250.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.80 : 1,906.20 = 833.40 : x
  2. Step 2: Convert to fraction form
    1,270.80/1,906.20 = 833.40/x
  3. Step 3: Cross multiply
    1,270.80x = 1,906.20 × 833.40
  4. Step 4: Simplify right side
    1,270.80x = 1,588,627.08
  5. Step 5: Solve for x
    x = 1,588,627.08/1,270.80
  6. Step 6: Final answer
    x = 1,250.10

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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.