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Finding the Fourth Proportional to 1,326.80, 1,990.20 and 1,256.40

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Solution

The fourth proportional to 1,326.80, 1,990.20 and 1,256.40 is: 1,884.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.80 : 1,990.20 = 1,256.40 : x
  2. Step 2: Convert to fraction form
    1,326.80/1,990.20 = 1,256.40/x
  3. Step 3: Cross multiply
    1,326.80x = 1,990.20 × 1,256.40
  4. Step 4: Simplify right side
    1,326.80x = 2,500,487.28
  5. Step 5: Solve for x
    x = 2,500,487.28/1,326.80
  6. Step 6: Final answer
    x = 1,884.60

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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.