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Finding the Fourth Proportional to 989.35, 1,365.31 and 547.27

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Solution

The fourth proportional to 989.35, 1,365.31 and 547.27 is: 755.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.35 : 1,365.31 = 547.27 : x
  2. Step 2: Convert to fraction form
    989.35/1,365.31 = 547.27/x
  3. Step 3: Cross multiply
    989.35x = 1,365.31 × 547.27
  4. Step 4: Simplify right side
    989.35x = 747,190.47
  5. Step 5: Solve for x
    x = 747,190.47/989.35
  6. Step 6: Final answer
    x = 755.24

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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.