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Finding the Fourth Proportional to 1,273.07, 1,756.80 and 749.13

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Solution

The fourth proportional to 1,273.07, 1,756.80 and 749.13 is: 1,033.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.07 : 1,756.80 = 749.13 : x
  2. Step 2: Convert to fraction form
    1,273.07/1,756.80 = 749.13/x
  3. Step 3: Cross multiply
    1,273.07x = 1,756.80 × 749.13
  4. Step 4: Simplify right side
    1,273.07x = 1,316,071.58
  5. Step 5: Solve for x
    x = 1,316,071.58/1,273.07
  6. Step 6: Final answer
    x = 1,033.78

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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.