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Finding the Fourth Proportional to 1,103.49, 1,653.94 and 485.90

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Solution

The fourth proportional to 1,103.49, 1,653.94 and 485.90 is: 728.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.49 : 1,653.94 = 485.90 : x
  2. Step 2: Convert to fraction form
    1,103.49/1,653.94 = 485.90/x
  3. Step 3: Cross multiply
    1,103.49x = 1,653.94 × 485.90
  4. Step 4: Simplify right side
    1,103.49x = 803,645.25
  5. Step 5: Solve for x
    x = 803,645.25/1,103.49
  6. Step 6: Final answer
    x = 728.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.