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Finding the Fourth Proportional to 1,140.80, 1,575.07 and 748.49

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Solution

The fourth proportional to 1,140.80, 1,575.07 and 748.49 is: 1,033.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.80 : 1,575.07 = 748.49 : x
  2. Step 2: Convert to fraction form
    1,140.80/1,575.07 = 748.49/x
  3. Step 3: Cross multiply
    1,140.80x = 1,575.07 × 748.49
  4. Step 4: Simplify right side
    1,140.80x = 1,178,914.40
  5. Step 5: Solve for x
    x = 1,178,914.40/1,140.80
  6. Step 6: Final answer
    x = 1,033.41

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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.