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Finding the Fourth Proportional to 1,275.21, 1,759.74 and 751.23

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Solution

The fourth proportional to 1,275.21, 1,759.74 and 751.23 is: 1,036.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.21 : 1,759.74 = 751.23 : x
  2. Step 2: Convert to fraction form
    1,275.21/1,759.74 = 751.23/x
  3. Step 3: Cross multiply
    1,275.21x = 1,759.74 × 751.23
  4. Step 4: Simplify right side
    1,275.21x = 1,321,969.48
  5. Step 5: Solve for x
    x = 1,321,969.48/1,275.21
  6. Step 6: Final answer
    x = 1,036.67

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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.