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Finding the Fourth Proportional to 1,128.00, 1,556.66 and 630.67

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Solution

The fourth proportional to 1,128.00, 1,556.66 and 630.67 is: 870.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.00 : 1,556.66 = 630.67 : x
  2. Step 2: Convert to fraction form
    1,128.00/1,556.66 = 630.67/x
  3. Step 3: Cross multiply
    1,128.00x = 1,556.66 × 630.67
  4. Step 4: Simplify right side
    1,128.00x = 981,736.40
  5. Step 5: Solve for x
    x = 981,736.40/1,128.00
  6. Step 6: Final answer
    x = 870.33

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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.