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Finding the Fourth Proportional to 1,003.45, 1,512.69 and 936.55

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Solution

The fourth proportional to 1,003.45, 1,512.69 and 936.55 is: 1,411.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.45 : 1,512.69 = 936.55 : x
  2. Step 2: Convert to fraction form
    1,003.45/1,512.69 = 936.55/x
  3. Step 3: Cross multiply
    1,003.45x = 1,512.69 × 936.55
  4. Step 4: Simplify right side
    1,003.45x = 1,416,706.04
  5. Step 5: Solve for x
    x = 1,416,706.04/1,003.45
  6. Step 6: Final answer
    x = 1,411.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.