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Finding the Fourth Proportional to 1,116.80, 1,540.74 and 644.48

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Solution

The fourth proportional to 1,116.80, 1,540.74 and 644.48 is: 889.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.80 : 1,540.74 = 644.48 : x
  2. Step 2: Convert to fraction form
    1,116.80/1,540.74 = 644.48/x
  3. Step 3: Cross multiply
    1,116.80x = 1,540.74 × 644.48
  4. Step 4: Simplify right side
    1,116.80x = 992,976.12
  5. Step 5: Solve for x
    x = 992,976.12/1,116.80
  6. Step 6: Final answer
    x = 889.13

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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.