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Finding the Fourth Proportional to 1,128.86, 1,694.50 and 999.66

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Solution

The fourth proportional to 1,128.86, 1,694.50 and 999.66 is: 1,500.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.86 : 1,694.50 = 999.66 : x
  2. Step 2: Convert to fraction form
    1,128.86/1,694.50 = 999.66/x
  3. Step 3: Cross multiply
    1,128.86x = 1,694.50 × 999.66
  4. Step 4: Simplify right side
    1,128.86x = 1,693,923.87
  5. Step 5: Solve for x
    x = 1,693,923.87/1,128.86
  6. Step 6: Final answer
    x = 1,500.56

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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.