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Finding the Fourth Proportional to 1,128.20, 1,556.68 and 662.20

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Solution

The fourth proportional to 1,128.20, 1,556.68 and 662.20 is: 913.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.20 : 1,556.68 = 662.20 : x
  2. Step 2: Convert to fraction form
    1,128.20/1,556.68 = 662.20/x
  3. Step 3: Cross multiply
    1,128.20x = 1,556.68 × 662.20
  4. Step 4: Simplify right side
    1,128.20x = 1,030,833.50
  5. Step 5: Solve for x
    x = 1,030,833.50/1,128.20
  6. Step 6: Final answer
    x = 913.70

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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.