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Finding the Fourth Proportional to 1,273.12, 1,756.92 and 721.12

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Solution

The fourth proportional to 1,273.12, 1,756.92 and 721.12 is: 995.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.12 : 1,756.92 = 721.12 : x
  2. Step 2: Convert to fraction form
    1,273.12/1,756.92 = 721.12/x
  3. Step 3: Cross multiply
    1,273.12x = 1,756.92 × 721.12
  4. Step 4: Simplify right side
    1,273.12x = 1,266,950.15
  5. Step 5: Solve for x
    x = 1,266,950.15/1,273.12
  6. Step 6: Final answer
    x = 995.15

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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.