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Finding the Fourth Proportional to 1,188.99, 1,640.57 and 741.06

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Solution

The fourth proportional to 1,188.99, 1,640.57 and 741.06 is: 1,022.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.99 : 1,640.57 = 741.06 : x
  2. Step 2: Convert to fraction form
    1,188.99/1,640.57 = 741.06/x
  3. Step 3: Cross multiply
    1,188.99x = 1,640.57 × 741.06
  4. Step 4: Simplify right side
    1,188.99x = 1,215,757.10
  5. Step 5: Solve for x
    x = 1,215,757.10/1,188.99
  6. Step 6: Final answer
    x = 1,022.51

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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.