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Finding the Fourth Proportional to 989.14, 1,365.11 and 740.03

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Solution

The fourth proportional to 989.14, 1,365.11 and 740.03 is: 1,021.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.14 : 1,365.11 = 740.03 : x
  2. Step 2: Convert to fraction form
    989.14/1,365.11 = 740.03/x
  3. Step 3: Cross multiply
    989.14x = 1,365.11 × 740.03
  4. Step 4: Simplify right side
    989.14x = 1,010,222.35
  5. Step 5: Solve for x
    x = 1,010,222.35/989.14
  6. Step 6: Final answer
    x = 1,021.31

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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.