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Finding the Fourth Proportional to 1,190.57, 1,643.90 and 748.71

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Solution

The fourth proportional to 1,190.57, 1,643.90 and 748.71 is: 1,033.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.57 : 1,643.90 = 748.71 : x
  2. Step 2: Convert to fraction form
    1,190.57/1,643.90 = 748.71/x
  3. Step 3: Cross multiply
    1,190.57x = 1,643.90 × 748.71
  4. Step 4: Simplify right side
    1,190.57x = 1,230,800.63
  5. Step 5: Solve for x
    x = 1,230,800.63/1,190.57
  6. Step 6: Final answer
    x = 1,033.80

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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.