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Finding the Fourth Proportional to 1,612.36, 2,225.46 and 991

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Solution

The fourth proportional to 1,612.36, 2,225.46 and 991 is: 1,367.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,612.36 : 2,225.46 = 991 : x
  2. Step 2: Convert to fraction form
    1,612.36/2,225.46 = 991/x
  3. Step 3: Cross multiply
    1,612.36x = 2,225.46 × 991
  4. Step 4: Simplify right side
    1,612.36x = 2,205,430.86
  5. Step 5: Solve for x
    x = 2,205,430.86/1,612.36
  6. Step 6: Final answer
    x = 1,367.83

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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.