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Finding the Fourth Proportional to 1,188.43, 1,639.77 and 746.17

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Solution

The fourth proportional to 1,188.43, 1,639.77 and 746.17 is: 1,029.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.43 : 1,639.77 = 746.17 : x
  2. Step 2: Convert to fraction form
    1,188.43/1,639.77 = 746.17/x
  3. Step 3: Cross multiply
    1,188.43x = 1,639.77 × 746.17
  4. Step 4: Simplify right side
    1,188.43x = 1,223,549.23
  5. Step 5: Solve for x
    x = 1,223,549.23/1,188.43
  6. Step 6: Final answer
    x = 1,029.55

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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.