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Finding the Fourth Proportional to 1,112.48, 1,535.43 and 640.69

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Solution

The fourth proportional to 1,112.48, 1,535.43 and 640.69 is: 884.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.48 : 1,535.43 = 640.69 : x
  2. Step 2: Convert to fraction form
    1,112.48/1,535.43 = 640.69/x
  3. Step 3: Cross multiply
    1,112.48x = 1,535.43 × 640.69
  4. Step 4: Simplify right side
    1,112.48x = 983,733.21
  5. Step 5: Solve for x
    x = 983,733.21/1,112.48
  6. Step 6: Final answer
    x = 884.27

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1.5x scale

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.