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Finding the Fourth Proportional to 989.51, 1,365.61 and 547.42

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Solution

The fourth proportional to 989.51, 1,365.61 and 547.42 is: 755.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.51 : 1,365.61 = 547.42 : x
  2. Step 2: Convert to fraction form
    989.51/1,365.61 = 547.42/x
  3. Step 3: Cross multiply
    989.51x = 1,365.61 × 547.42
  4. Step 4: Simplify right side
    989.51x = 747,562.23
  5. Step 5: Solve for x
    x = 747,562.23/989.51
  6. Step 6: Final answer
    x = 755.49

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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.