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Finding the Fourth Proportional to 1,112.53, 1,535.22 and 640.39

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Solution

The fourth proportional to 1,112.53, 1,535.22 and 640.39 is: 883.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.53 : 1,535.22 = 640.39 : x
  2. Step 2: Convert to fraction form
    1,112.53/1,535.22 = 640.39/x
  3. Step 3: Cross multiply
    1,112.53x = 1,535.22 × 640.39
  4. Step 4: Simplify right side
    1,112.53x = 983,139.54
  5. Step 5: Solve for x
    x = 983,139.54/1,112.53
  6. Step 6: Final answer
    x = 883.70

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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.