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Finding the Fourth Proportional to 1,128.56, 1,690.22 and 1,089.63

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Solution

The fourth proportional to 1,128.56, 1,690.22 and 1,089.63 is: 1,631.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.56 : 1,690.22 = 1,089.63 : x
  2. Step 2: Convert to fraction form
    1,128.56/1,690.22 = 1,089.63/x
  3. Step 3: Cross multiply
    1,128.56x = 1,690.22 × 1,089.63
  4. Step 4: Simplify right side
    1,128.56x = 1,841,708.97
  5. Step 5: Solve for x
    x = 1,841,708.97/1,128.56
  6. Step 6: Final answer
    x = 1,631.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.