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Finding the Fourth Proportional to 1,178.49, 1,626.28 and 667.41

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Solution

The fourth proportional to 1,178.49, 1,626.28 and 667.41 is: 921.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.49 : 1,626.28 = 667.41 : x
  2. Step 2: Convert to fraction form
    1,178.49/1,626.28 = 667.41/x
  3. Step 3: Cross multiply
    1,178.49x = 1,626.28 × 667.41
  4. Step 4: Simplify right side
    1,178.49x = 1,085,395.53
  5. Step 5: Solve for x
    x = 1,085,395.53/1,178.49
  6. Step 6: Final answer
    x = 921.01

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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.