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Finding the Fourth Proportional to 1,112.58, 1,535.49 and 640.55

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Solution

The fourth proportional to 1,112.58, 1,535.49 and 640.55 is: 884.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.58 : 1,535.49 = 640.55 : x
  2. Step 2: Convert to fraction form
    1,112.58/1,535.49 = 640.55/x
  3. Step 3: Cross multiply
    1,112.58x = 1,535.49 × 640.55
  4. Step 4: Simplify right side
    1,112.58x = 983,550.44
  5. Step 5: Solve for x
    x = 983,550.44/1,112.58
  6. Step 6: Final answer
    x = 884.03

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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.