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Finding the Fourth Proportional to 989.45, 1,365.45 and 547.39

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Solution

The fourth proportional to 989.45, 1,365.45 and 547.39 is: 755.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.45 : 1,365.45 = 547.39 : x
  2. Step 2: Convert to fraction form
    989.45/1,365.45 = 547.39/x
  3. Step 3: Cross multiply
    989.45x = 1,365.45 × 547.39
  4. Step 4: Simplify right side
    989.45x = 747,426.85
  5. Step 5: Solve for x
    x = 747,426.85/989.45
  6. Step 6: Final answer
    x = 755.40

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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.