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Finding the Fourth Proportional to 1,112.60, 1,535.32 and 640.56

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Solution

The fourth proportional to 1,112.60, 1,535.32 and 640.56 is: 883.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.60 : 1,535.32 = 640.56 : x
  2. Step 2: Convert to fraction form
    1,112.60/1,535.32 = 640.56/x
  3. Step 3: Cross multiply
    1,112.60x = 1,535.32 × 640.56
  4. Step 4: Simplify right side
    1,112.60x = 983,464.58
  5. Step 5: Solve for x
    x = 983,464.58/1,112.60
  6. Step 6: Final answer
    x = 883.93

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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.