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Finding the Fourth Proportional to 1,101.04, 1,643.12 and 939.04

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Solution

The fourth proportional to 1,101.04, 1,643.12 and 939.04 is: 1,401.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.04 : 1,643.12 = 939.04 : x
  2. Step 2: Convert to fraction form
    1,101.04/1,643.12 = 939.04/x
  3. Step 3: Cross multiply
    1,101.04x = 1,643.12 × 939.04
  4. Step 4: Simplify right side
    1,101.04x = 1,542,955.40
  5. Step 5: Solve for x
    x = 1,542,955.40/1,101.04
  6. Step 6: Final answer
    x = 1,401.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.