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Finding the Fourth Proportional to 1,328.06, 1,991.35 and 547.83

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Solution

The fourth proportional to 1,328.06, 1,991.35 and 547.83 is: 821.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.06 : 1,991.35 = 547.83 : x
  2. Step 2: Convert to fraction form
    1,328.06/1,991.35 = 547.83/x
  3. Step 3: Cross multiply
    1,328.06x = 1,991.35 × 547.83
  4. Step 4: Simplify right side
    1,328.06x = 1,090,921.96
  5. Step 5: Solve for x
    x = 1,090,921.96/1,328.06
  6. Step 6: Final answer
    x = 821.44

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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.