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Finding the Fourth Proportional to 1,372.80, 2,056.40 and 851.20

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Solution

The fourth proportional to 1,372.80, 2,056.40 and 851.20 is: 1,275.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.80 : 2,056.40 = 851.20 : x
  2. Step 2: Convert to fraction form
    1,372.80/2,056.40 = 851.20/x
  3. Step 3: Cross multiply
    1,372.80x = 2,056.40 × 851.20
  4. Step 4: Simplify right side
    1,372.80x = 1,750,407.68
  5. Step 5: Solve for x
    x = 1,750,407.68/1,372.80
  6. Step 6: Final answer
    x = 1,275.06

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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.