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Finding the Fourth Proportional to 1,128.03, 1,555.10 and 812.73

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Solution

The fourth proportional to 1,128.03, 1,555.10 and 812.73 is: 1,120.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.03 : 1,555.10 = 812.73 : x
  2. Step 2: Convert to fraction form
    1,128.03/1,555.10 = 812.73/x
  3. Step 3: Cross multiply
    1,128.03x = 1,555.10 × 812.73
  4. Step 4: Simplify right side
    1,128.03x = 1,263,881.24
  5. Step 5: Solve for x
    x = 1,263,881.24/1,128.03
  6. Step 6: Final answer
    x = 1,120.44

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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.